---
_id: '11074'
article_processing_charge: No
article_type: original
author:
- first_name: Emily M.
full_name: Hatch, Emily M.
last_name: Hatch
- first_name: Martin W
full_name: HETZER, Martin W
id: 86c0d31b-b4eb-11ec-ac5a-eae7b2e135ed
last_name: HETZER
orcid: 0000-0002-2111-992X
citation:
ama: Hatch EM, Hetzer M. Chromothripsis. Current Biology. 2015;25(10):PR397-R399.
doi:10.1016/j.cub.2015.02.033
apa: Hatch, E. M., & Hetzer, M. (2015). Chromothripsis. Current Biology.
Elsevier. https://doi.org/10.1016/j.cub.2015.02.033
chicago: Hatch, Emily M., and Martin Hetzer. “Chromothripsis.” Current Biology.
Elsevier, 2015. https://doi.org/10.1016/j.cub.2015.02.033.
ieee: E. M. Hatch and M. Hetzer, “Chromothripsis,” Current Biology, vol.
25, no. 10. Elsevier, pp. PR397-R399, 2015.
ista: Hatch EM, Hetzer M. 2015. Chromothripsis. Current Biology. 25(10), PR397-R399.
mla: Hatch, Emily M., and Martin Hetzer. “Chromothripsis.” Current Biology,
vol. 25, no. 10, Elsevier, 2015, pp. PR397-R399, doi:10.1016/j.cub.2015.02.033.
short: E.M. Hatch, M. Hetzer, Current Biology 25 (2015) PR397-R399.
date_created: 2022-04-07T07:49:00Z
date_published: 2015-05-18T00:00:00Z
date_updated: 2022-07-18T08:34:34Z
day: '18'
doi: 10.1016/j.cub.2015.02.033
extern: '1'
external_id:
pmid:
- '25989073'
intvolume: ' 25'
issue: '10'
keyword:
- General Agricultural and Biological Sciences
- General Biochemistry
- Genetics and Molecular Biology
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1016/j.cub.2015.02.033
month: '05'
oa: 1
oa_version: Published Version
page: PR397-R399
pmid: 1
publication: Current Biology
publication_identifier:
issn:
- 0960-9822
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: Chromothripsis
type: journal_article
user_id: 72615eeb-f1f3-11ec-aa25-d4573ddc34fd
volume: 25
year: '2015'
...
---
_id: '11519'
abstract:
- lang: eng
text: 'Faint Lyα emitters become increasingly rarer toward the reionization epoch
(z ∼ 6–7). However, observations from a very large (∼5 deg2) Lyα narrow-band survey
at z = 6.6 show that this is not the case for the most luminous emitters, capable
of ionizing their own local bubbles. Here we present follow-up observations of
the two most luminous Lyα candidates in the COSMOS field: “MASOSA” and “CR7.”
We used X-SHOOTER, SINFONI, and FORS2 on the Very Large Telescope, and DEIMOS
on Keck, to confirm both candidates beyond any doubt. We find redshifts of z =
6.541 and z = 6.604 for “MASOSA” and “CR7,” respectively. MASOSA has a strong
detection in Lyα with a line width of 386 ± 30 km s−1 (FWHM) and with very high
EW0 (>200 Å), but undetected in the continuum, implying very low stellar mass
and a likely young, metal-poor stellar population. “CR7,” with an observed Lyα
luminosity of 1043.92±0.05 erg s−1 is the most luminous Lyα emitter ever found
at z > 6 and is spatially extended (∼16 kpc). “CR7” reveals a narrow Lyα line
with 266 ± 15 km s−1 FWHM, being detected in the near-infrared (NIR) (rest-frame
UV; β = −2.3 ± 0.1) and in IRAC/Spitzer. We detect a narrow He II 1640 Å emission
line (6σ, FWHM = 130 ± 30 km s−1 ) in CR7 which can explain the clear excess seen
in the J-band photometry (EW0 ∼ 80 Å). We find no other emission lines from the
UV to the NIR in our X-SHOOTER spectra (He II/O III] 1663 Å > 3 and He II/C III]
1908 Å > 2.5). We conclude that CR7 is best explained by a combination of a PopIII-like
population, which dominates the rest-frame UV and the nebular emission, and a
more normal stellar population, which presumably dominates the mass. Hubble Space
Telescope/WFC3 observations show that the light is indeed spatially separated
between a very blue component, coincident with Lyα and He II emission, and two
red components (∼5 kpc away), which dominate the mass. Our findings are consistent
with theoretical predictions of a PopIII wave, with PopIII star formation migrating
away from the original sites of star formation.'
acknowledgement: We thank the anonymous reviewer for useful and constructive comments
and suggestions which greatly improved the quality and clarity of our work. D.S.
acknowledges financial support from the Netherlands Organisation for Scientific
research (NWO) through a Veni fellowship, from FCT through a FCT Investigator Starting
Grant and Start-up Grant (IF/01154/2012/CP0189/CT0010), from FCT grant UID/FIS/04434/2013,
and from LSF and LKBF. J.M. acknowledges the award of a Huygens PhD fellowship.
H.R. acknowledges support from the ERC Advanced Investigator program NewClusters
321271. The authors thank Mark Dijkstra, Bhaskar Agarwal, Jarrett Johnson, Andrea
Ferrara, Jarle Brinchmann, Rebecca Bowler, George Becker, Emma Curtis-Lake, Milos
Milosavljevic, Raffaella Schneider, Paul Shapiro, and Erik Zackrisson for interesting,
stimulating and helpful discussions. The authors are extremely grateful to ESO for
the award of ESO DDT time (294.A-5018 and 294.A-5039) which allowed the spectroscopic
confirmation of both sources and the detailed investigation of their nature. Observations
are also based on data from W.M. Keck Observatory. The W.M. Keck Observatory is
operated as a scientific partnership of Caltech, the University of California and
the National Aeronautics and Space Administration. Based on observations obtained
with MegaPrime/Megacam, a joint project of CFHT and CEA/IRFU, at the Canada–France–Hawaii
Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada,
the Institut National des Science de lUnivers of the Centre National de la Recherche
Scientifique (CNRS) of France, and the University of Hawaii. This work is based
in part on data products produced at Terapix available at the Canadian Astronomy
Data Centre as part of the Canada–France–Hawaii Telescope Legacy Survey, a collaborative
project of NRC and CNRS. Based on data products from observations made with ESO
Telescopes at the La Silla Paranal Observatory under ESO programme IDs 294.A-5018,
294.A-5039, and 179.A-2005, and on data products produced by TERAPIX and the Cambridge
Astronomy Survey Unit on behalf of the UltraVISTA consortium. The authors acknowledge
the award of service time (SW2014b20) on the William Herschel Telescope (WHT). WHT
and its service programme are operated on the island of La Palma by the Isaac Newton
Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de
Astrofisica de Canarias.
article_processing_charge: No
article_type: original
author:
- first_name: David
full_name: Sobral, David
last_name: Sobral
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
- first_name: Behnam
full_name: Darvish, Behnam
last_name: Darvish
- first_name: Daniel
full_name: Schaerer, Daniel
last_name: Schaerer
- first_name: Bahram
full_name: Mobasher, Bahram
last_name: Mobasher
- first_name: Huub
full_name: Röttgering, Huub
last_name: Röttgering
- first_name: Sérgio
full_name: Santos, Sérgio
last_name: Santos
- first_name: Shoubaneh
full_name: Hemmati, Shoubaneh
last_name: Hemmati
citation:
ama: 'Sobral D, Matthee JJ, Darvish B, et al. Evidence for PopIII-like stellar populations
in the most luminous Lyα emitters at the epoch of reionisation: Spectroscopic
confirmation. The Astrophysical Journal. 2015;808(2):139. doi:10.1088/0004-637X/808/2/139'
apa: 'Sobral, D., Matthee, J. J., Darvish, B., Schaerer, D., Mobasher, B., Röttgering,
H., … Hemmati, S. (2015). Evidence for PopIII-like stellar populations in the
most luminous Lyα emitters at the epoch of reionisation: Spectroscopic confirmation.
The Astrophysical Journal. IOP Publishing. https://doi.org/10.1088/0004-637X/808/2/139'
chicago: 'Sobral, David, Jorryt J Matthee, Behnam Darvish, Daniel Schaerer, Bahram
Mobasher, Huub Röttgering, Sérgio Santos, and Shoubaneh Hemmati. “Evidence for
PopIII-like Stellar Populations in the Most Luminous Lyα Emitters at the Epoch
of Reionisation: Spectroscopic Confirmation.” The Astrophysical Journal.
IOP Publishing, 2015. https://doi.org/10.1088/0004-637X/808/2/139.'
ieee: 'D. Sobral et al., “Evidence for PopIII-like stellar populations in
the most luminous Lyα emitters at the epoch of reionisation: Spectroscopic confirmation,”
The Astrophysical Journal, vol. 808, no. 2. IOP Publishing, p. 139, 2015.'
ista: 'Sobral D, Matthee JJ, Darvish B, Schaerer D, Mobasher B, Röttgering H, Santos
S, Hemmati S. 2015. Evidence for PopIII-like stellar populations in the most luminous
Lyα emitters at the epoch of reionisation: Spectroscopic confirmation. The Astrophysical
Journal. 808(2), 139.'
mla: 'Sobral, David, et al. “Evidence for PopIII-like Stellar Populations in the
Most Luminous Lyα Emitters at the Epoch of Reionisation: Spectroscopic Confirmation.”
The Astrophysical Journal, vol. 808, no. 2, IOP Publishing, 2015, p. 139,
doi:10.1088/0004-637X/808/2/139.'
short: D. Sobral, J.J. Matthee, B. Darvish, D. Schaerer, B. Mobasher, H. Röttgering,
S. Santos, S. Hemmati, The Astrophysical Journal 808 (2015) 139.
date_created: 2022-07-07T09:00:58Z
date_published: 2015-07-28T00:00:00Z
date_updated: 2022-08-18T10:30:13Z
day: '28'
doi: 10.1088/0004-637X/808/2/139
extern: '1'
external_id:
arxiv:
- '1504.01734'
intvolume: ' 808'
issue: '2'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- dark ages
- reionization
- 'first stars – early universe – galaxies: evolution'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1504.01734
month: '07'
oa: 1
oa_version: Preprint
page: '139'
publication: The Astrophysical Journal
publication_identifier:
eissn:
- 1538-4357
issn:
- 0004-637X
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Evidence for PopIII-like stellar populations in the most luminous Lyα emitters
at the epoch of reionisation: Spectroscopic confirmation'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 808
year: '2015'
...
---
_id: '11580'
abstract:
- lang: eng
text: 'We present results from the largest contiguous narrow-band survey in the
near-infrared. We have used the wide-field infrared camera/Canada–France–Hawaii
Telescope and the lowOH2 filter (1.187 ± 0.005 μm) to survey ≈10 deg2 of contiguous
extragalactic sky in the SA22 field. A total of ∼6000 candidate emission-line
galaxies are found. We use deep ugrizJK data to obtain robust photometric redshifts.
We combine our data with the High-redshift(Z) Emission Line Survey (HiZELS), explore
spectroscopic surveys (VVDS, VIPERS) and obtain our own spectroscopic follow-up
with KMOS, FMOS and MOSFIRE to derive large samples of high-redshift emission-line
selected galaxies: 3471 Hα emitters at z = 0.8, 1343 [O III] + Hβ emitters at
z = 1.4 and 572 [O II] emitters at z = 2.2. We probe comoving volumes of >106
Mpc3 and find significant overdensities, including an 8.5σ (spectroscopically
confirmed) overdensity of Hα emitters at z = 0.81. We derive Hα, [O III] + Hβ
and [O II] luminosity functions at z = 0.8, 1.4, 2.2, respectively, and present
implications for future surveys such as Euclid. Our uniquely large volumes/areas
allow us to subdivide the samples in thousands of randomized combinations of areas
and provide a robust empirical measurement of sample/cosmic variance. We show
that surveys for star-forming/emission-line galaxies at a depth similar to ours
can only overcome cosmic-variance (errors <10 per cent) if they are based on volumes
>5 × 105 Mpc3; errors on L* and ϕ* due to sample (cosmic) variance on surveys
probing ∼104 and ∼105 Mpc3 are typically very high: ∼300 and ∼40–60 per cent,
respectively.'
acknowledgement: The authors wish to thank the anonymous reviewer for many helpful
comments and suggestions which greatly improved the clarity and quality of this
work. DS acknowledges financial support from the Netherlands Organization for Scientific
research (NWO) through a Veni fellowship, from FCT through an FCT Investigator Starting
Grant and Start-up Grant (IF/01154/2012/CP0189/CT0010), from FCT grant PEst-OE/FIS/UI2751/2014,
and from LSF and LKBF. JM acknowledges the award of a Huygens PhD fellowship. PNB
is grateful for support from STFC. IRS acknowledges support from STFC, a Leverhulme
Fellowship, the ERC Advanced Investigator programme DUSTYGAL and a Royal Society/Wolfson
Merit Award. BMJ acknowledges support from the ERC-StG grant EGGS-278202. The Dark
Cosmology Centre is funded by the DNRF. The Dark Cosmology Centre is funded by the
DNRF. JWK acknowledges support from the National Research Foundation of Korea (NRF)
grant, no. 2008-0060544, funded by the Korea government (MSIP). JPS acknowledges
support from STFC (ST/I001573/1). JC acknowledges support from the FCT-IF grant
IF/01154/2012/CP0189/CT0010. The work was only possible due to OPTICON/FP7 and the
invaluable access that it granted to the CFHT telescope. We would also like to acknowledge
the excellent work done by CFHT staff in conducting the observations in service
mode, and on delivering truly excellent data. We are also tremendously thankful
to Kentaro Aoki for the incredible support while observing at Subaru with FMOS,
and also to the Keck staff for the help with the observations with MOSFIRE. This
work is based on observations obtained with WIRCam on the CFHT, OPTICON programme
2011B/029, 2012A019 and 2012B/016. Based on observations made with ESO telescopes
at the La Silla Paranal Observatory under programmes IDs 60.A-9460 (data can be
accessed through the ESO data archive), 087.A 0337 and 089.A-0965. Based on observations
done with FMOS on Subaru under programme S14A-084, and on MOSFIRE/Keck observations
under programme U066M. Part of the data on which this analysis is based are available
from Sobral et al. (2013a). Dedicated to the memory of C. M. Sobral (1953-2014).
article_processing_charge: No
article_type: original
author:
- first_name: D.
full_name: Sobral, D.
last_name: Sobral
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
- first_name: P. N.
full_name: Best, P. N.
last_name: Best
- first_name: I.
full_name: Smail, I.
last_name: Smail
- first_name: A. A.
full_name: Khostovan, A. A.
last_name: Khostovan
- first_name: B.
full_name: Milvang-Jensen, B.
last_name: Milvang-Jensen
- first_name: J.-W.
full_name: Kim, J.-W.
last_name: Kim
- first_name: J.
full_name: Stott, J.
last_name: Stott
- first_name: J.
full_name: Calhau, J.
last_name: Calhau
- first_name: H.
full_name: Nayyeri, H.
last_name: Nayyeri
- first_name: B.
full_name: Mobasher, B.
last_name: Mobasher
citation:
ama: 'Sobral D, Matthee JJ, Best PN, et al. CF-HiZELS, an ∼10 deg2 emission-line
survey with spectroscopic follow-up: Hα, [O III] + Hβ and [O II] luminosity functions
at z = 0.8, 1.4 and 2.2 . Monthly Notices of the Royal Astronomical Society.
2015;451(3):2303-2323. doi:10.1093/mnras/stv1076'
apa: 'Sobral, D., Matthee, J. J., Best, P. N., Smail, I., Khostovan, A. A., Milvang-Jensen,
B., … Mobasher, B. (2015). CF-HiZELS, an ∼10 deg2 emission-line survey with spectroscopic
follow-up: Hα, [O III] + Hβ and [O II] luminosity functions at z = 0.8, 1.4 and
2.2 . Monthly Notices of the Royal Astronomical Society. Oxford University
Press. https://doi.org/10.1093/mnras/stv1076'
chicago: 'Sobral, D., Jorryt J Matthee, P. N. Best, I. Smail, A. A. Khostovan, B.
Milvang-Jensen, J.-W. Kim, et al. “CF-HiZELS, an ∼10 Deg2 Emission-Line Survey
with Spectroscopic Follow-up: Hα, [O III] + Hβ and [O II] Luminosity Functions
at z = 0.8, 1.4 and 2.2 .” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2015. https://doi.org/10.1093/mnras/stv1076.'
ieee: 'D. Sobral et al., “CF-HiZELS, an ∼10 deg2 emission-line survey with
spectroscopic follow-up: Hα, [O III] + Hβ and [O II] luminosity functions at z
= 0.8, 1.4 and 2.2 ,” Monthly Notices of the Royal Astronomical Society,
vol. 451, no. 3. Oxford University Press, pp. 2303–2323, 2015.'
ista: 'Sobral D, Matthee JJ, Best PN, Smail I, Khostovan AA, Milvang-Jensen B, Kim
J-W, Stott J, Calhau J, Nayyeri H, Mobasher B. 2015. CF-HiZELS, an ∼10 deg2 emission-line
survey with spectroscopic follow-up: Hα, [O III] + Hβ and [O II] luminosity functions
at z = 0.8, 1.4 and 2.2 . Monthly Notices of the Royal Astronomical Society. 451(3),
2303–2323.'
mla: 'Sobral, D., et al. “CF-HiZELS, an ∼10 Deg2 Emission-Line Survey with Spectroscopic
Follow-up: Hα, [O III] + Hβ and [O II] Luminosity Functions at z = 0.8, 1.4 and
2.2 .” Monthly Notices of the Royal Astronomical Society, vol. 451, no.
3, Oxford University Press, 2015, pp. 2303–23, doi:10.1093/mnras/stv1076.'
short: D. Sobral, J.J. Matthee, P.N. Best, I. Smail, A.A. Khostovan, B. Milvang-Jensen,
J.-W. Kim, J. Stott, J. Calhau, H. Nayyeri, B. Mobasher, Monthly Notices of the
Royal Astronomical Society 451 (2015) 2303–2323.
date_created: 2022-07-14T09:02:22Z
date_published: 2015-08-11T00:00:00Z
date_updated: 2022-08-19T08:23:18Z
day: '11'
doi: 10.1093/mnras/stv1076
extern: '1'
external_id:
arxiv:
- '1502.06602'
intvolume: ' 451'
issue: '3'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- 'galaxies: evolution'
- 'galaxies: formation'
- 'galaxies: luminosity function'
- mass function
- 'cosmology: observations'
- early Universe
- large-scale structure of Universe
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1502.06602
month: '08'
oa: 1
oa_version: Preprint
page: 2303-2323
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'CF-HiZELS, an ∼10 deg2 emission-line survey with spectroscopic follow-up:
Hα, [O III] + Hβ and [O II] luminosity functions at z = 0.8, 1.4 and 2.2 '
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 451
year: '2015'
...
---
_id: '11581'
abstract:
- lang: eng
text: Using wide-field narrow-band surveys, we provide a new measurement of the
z = 6.6 Lymanα emitter (LAE) luminosity function (LF), which constraints the bright
end for the first time. We use a combination of archival narrow-band NB921 data
in UDS and new NB921 measurements in SA22 and COSMOS/UltraVISTA, all observed
with the Subaru telescope, with a total area of ∼5 deg2. We exclude lower redshift
interlopers by using broad-band optical and near-infrared photometry and also
exclude three supernovae with data split over multiple epochs. Combining the UDS
and COSMOS samples, we find no evolution of the bright end of the Lyα LF between
z = 5.7 and 6.6, which is supported by spectroscopic follow-up, and conclude that
sources with Himiko-like luminosity are not as rare as previously thought, with
number densities of ∼1.5 × 10−5 Mpc−3. Combined with our wide-field SA22 measurements,
our results indicate a non-Schechter-like bright end of the LF at z = 6.6 and
a different evolution of observed faint and bright LAEs, overcoming cosmic variance.
This differential evolution is also seen in the spectroscopic follow-up of UV-selected
galaxies and is now also confirmed for LAEs, and we argue that it may be an effect
of reionization. Using a toy model, we show that such differential evolution of
the LF is expected, since brighter sources are able to ionize their surroundings
earlier, such that Lyα photons are able to escape. Our targets are excellent candidates
for detailed follow-up studies and provide the possibility to give a unique view
on the earliest stages in the formation of galaxies and reionization process.
acknowledgement: "We thank the anonymous referee for the comments and suggestions
which have improved the quality of this work. We thank Masami Ouchi for his useful
comments on an earlier version of this paper. JM acknowledges the support of a Huygens
PhD fellowship from Leiden University and is thankful for the hospitality of the
Center for Astronomy and Astrophysics of the University of Lisbon where part of
this research has been done. DS acknowledges financial support from the Netherlands
Organization for Scientific research (NWO) through a Veni fellowship, from FCT through
a FCT Investigator Starting Grant and Start-up Grant (IF/01154/2012/CP0189/CT0010)
and from FCT grant PEstOE/FIS/UI2751/2014. HR acknowledges support from the ERC
Advanced Investigator programme NewClusters 321271. We acknowledge the award of
ESO DDT time (294.A-5018) for providing the possibility of a timely publication
of this work.\r\nBased on observations with the Subaru Telescope (Programme IDs:
our observations: S14A-086; archival: S05B-027, S06A-025, S06B-010, S07A-013, S07B-008,
S08B-008 and S09A-017) and the W.M. Keck Observatory. The Subaru telescope is operated
by the National Astronomical Observatory of Japan. The W.M. Keck Observatory is
operated as a scientific partnership among the California Institute of Technology,
the University of California and the National Aeronautics and Space Administration.
Based on observations made with ESO Telescopes at the La Silla Paranal Observatory
under programme ID 294.A-5018. Based on observations obtained with MegaPrime/Megacam,
a joint project of CFHT and CEA/IRFU, at the Canada–France-Hawaii Telescope (CFHT)
which is operated by the National Research Council (NRC) of Canada, the Institut
National des Science de l’Univers of the Centre National de la Recherche Scientifique
(CNRS) of France, and the University of Hawaii. This work is based in part on data
products produced at Terapix available at the Canadian Astronomy Data Centre as
part of the CFHT Legacy Survey, a collaborative project of NRC and CNRS. Based on
data products from observations made with ESO Telescopes at the La Silla Paranal
Observatory under ESO programme ID 179.A-2005 and on data products produced by TERAPIX
and the Cambridge Astronomy Survey Unit on behalf of the UltraVISTA consortium.\r\nIn
addition to the CFHT-LS and COSMOS-UltraVISTA surveys, we are grateful for the excellent
data sets from the UKIRT-DXS, SXDF and S-COSMOS survey teams, without these legacy
surveys, this research would have been impossible. We have benefited greatly from
the public available programming language PYTHON, including the NUMPY, MATPLOTLIB,
PYFITS, SCIPY and ASTROPY packages, the astronomical imaging tools SEXTRACTOR, SWARP
and SCAMP and the indispensable TOPCAT analysis tool (Taylor 2013)"
article_processing_charge: No
article_type: original
author:
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
- first_name: David
full_name: Sobral, David
last_name: Sobral
- first_name: Sérgio
full_name: Santos, Sérgio
last_name: Santos
- first_name: Huub
full_name: Röttgering, Huub
last_name: Röttgering
- first_name: Behnam
full_name: Darvish, Behnam
last_name: Darvish
- first_name: Bahram
full_name: Mobasher, Bahram
last_name: Mobasher
citation:
ama: 'Matthee JJ, Sobral D, Santos S, Röttgering H, Darvish B, Mobasher B. Identification
of the brightest Lyα emitters at z = 6.6: implications for the evolution of the
luminosity function in the reionization era. Monthly Notices of the Royal Astronomical
Society. 2015;451(1):400-417. doi:10.1093/mnras/stv947'
apa: 'Matthee, J. J., Sobral, D., Santos, S., Röttgering, H., Darvish, B., &
Mobasher, B. (2015). Identification of the brightest Lyα emitters at z = 6.6:
implications for the evolution of the luminosity function in the reionization
era. Monthly Notices of the Royal Astronomical Society. Oxford University
Press. https://doi.org/10.1093/mnras/stv947'
chicago: 'Matthee, Jorryt J, David Sobral, Sérgio Santos, Huub Röttgering, Behnam
Darvish, and Bahram Mobasher. “Identification of the Brightest Lyα Emitters at
z = 6.6: Implications for the Evolution of the Luminosity Function in the Reionization
Era.” Monthly Notices of the Royal Astronomical Society. Oxford University
Press, 2015. https://doi.org/10.1093/mnras/stv947.'
ieee: 'J. J. Matthee, D. Sobral, S. Santos, H. Röttgering, B. Darvish, and B. Mobasher,
“Identification of the brightest Lyα emitters at z = 6.6: implications for the
evolution of the luminosity function in the reionization era,” Monthly Notices
of the Royal Astronomical Society, vol. 451, no. 1. Oxford University Press,
pp. 400–417, 2015.'
ista: 'Matthee JJ, Sobral D, Santos S, Röttgering H, Darvish B, Mobasher B. 2015.
Identification of the brightest Lyα emitters at z = 6.6: implications for the
evolution of the luminosity function in the reionization era. Monthly Notices
of the Royal Astronomical Society. 451(1), 400–417.'
mla: 'Matthee, Jorryt J., et al. “Identification of the Brightest Lyα Emitters at
z = 6.6: Implications for the Evolution of the Luminosity Function in the Reionization
Era.” Monthly Notices of the Royal Astronomical Society, vol. 451, no.
1, Oxford University Press, 2015, pp. 400–17, doi:10.1093/mnras/stv947.'
short: J.J. Matthee, D. Sobral, S. Santos, H. Röttgering, B. Darvish, B. Mobasher,
Monthly Notices of the Royal Astronomical Society 451 (2015) 400–417.
date_created: 2022-07-14T11:57:03Z
date_published: 2015-07-21T00:00:00Z
date_updated: 2022-08-19T08:25:25Z
day: '21'
doi: 10.1093/mnras/stv947
extern: '1'
external_id:
arxiv:
- '1502.07355'
intvolume: ' 451'
issue: '1'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1502.07355
month: '07'
oa: 1
oa_version: Preprint
page: 400-417
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Identification of the brightest Lyα emitters at z = 6.6: implications for
the evolution of the luminosity function in the reionization era'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 451
year: '2015'
...
---
_id: '11579'
abstract:
- lang: eng
text: CR7 is the brightest z = 6.6 Ly α emitter (LAE) known to date, and spectroscopic
follow-up by Sobral et al. suggests that CR7 might host Population (Pop) III stars.
We examine this interpretation using cosmological hydrodynamical simulations.
Several simulated galaxies show the same ‘Pop III wave’ pattern observed in CR7.
However, to reproduce the extreme CR7 Ly α/He II1640 line luminosities (Lα/HeII)
a top-heavy initial mass function and a massive ( ≳ 107 M⊙) Pop III burst with
age ≲ 2 Myr are required. Assuming that the observed properties of Ly α and He II
emission are typical for Pop III, we predict that in the COSMOS/UDS/SA22 fields,
14 out of the 30 LAEs at z = 6.6 with Lα > 1043.3 erg s−1 should also host Pop
III stars producing an observable LHeII≳1042.7ergs−1. As an alternate explanation,
we explore the possibility that CR7 is instead powered by accretion on to a direct
collapse black hole. Our model predicts Lα, LHeII, and X-ray luminosities that
are in agreement with the observations. In any case, the observed properties of
CR7 indicate that this galaxy is most likely powered by sources formed from pristine
gas. We propose that further X-ray observations can distinguish between the two
above scenarios.
acknowledgement: SS acknowledges support from the Netherlands Organization for Scientific
research (NWO), VENI grant 639.041.233. RS acknowledges support from the European
Research Council under the European Union (FP/2007-2013)/ERC grant agreement no.
306476. DS acknowledges (i) financial support from the NWO through a Veni fellowship
and (ii) funding from FCT through a FCT Investigator Starting Grant and Start-up
Grant (IF/01154/2012/CP0189/CT0010) and from FCT grant PEstOE/FIS/UI2751/2014.
article_processing_charge: No
article_type: original
author:
- first_name: A.
full_name: Pallottini, A.
last_name: Pallottini
- first_name: A.
full_name: Ferrara, A.
last_name: Ferrara
- first_name: F.
full_name: Pacucci, F.
last_name: Pacucci
- first_name: S.
full_name: Gallerani, S.
last_name: Gallerani
- first_name: S.
full_name: Salvadori, S.
last_name: Salvadori
- first_name: R.
full_name: Schneider, R.
last_name: Schneider
- first_name: D.
full_name: Schaerer, D.
last_name: Schaerer
- first_name: D.
full_name: Sobral, D.
last_name: Sobral
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
citation:
ama: 'Pallottini A, Ferrara A, Pacucci F, et al. The brightest Lyα emitter: Pop
III or black hole? Monthly Notices of the Royal Astronomical Society. 2015;453(3):2465-2470.
doi:10.1093/mnras/stv1795'
apa: 'Pallottini, A., Ferrara, A., Pacucci, F., Gallerani, S., Salvadori, S., Schneider,
R., … Matthee, J. J. (2015). The brightest Lyα emitter: Pop III or black hole?
Monthly Notices of the Royal Astronomical Society. Oxford University Press.
https://doi.org/10.1093/mnras/stv1795'
chicago: 'Pallottini, A., A. Ferrara, F. Pacucci, S. Gallerani, S. Salvadori, R.
Schneider, D. Schaerer, D. Sobral, and Jorryt J Matthee. “The Brightest Lyα Emitter:
Pop III or Black Hole?” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2015. https://doi.org/10.1093/mnras/stv1795.'
ieee: 'A. Pallottini et al., “The brightest Lyα emitter: Pop III or black
hole?,” Monthly Notices of the Royal Astronomical Society, vol. 453, no.
3. Oxford University Press, pp. 2465–2470, 2015.'
ista: 'Pallottini A, Ferrara A, Pacucci F, Gallerani S, Salvadori S, Schneider R,
Schaerer D, Sobral D, Matthee JJ. 2015. The brightest Lyα emitter: Pop III or
black hole? Monthly Notices of the Royal Astronomical Society. 453(3), 2465–2470.'
mla: 'Pallottini, A., et al. “The Brightest Lyα Emitter: Pop III or Black Hole?”
Monthly Notices of the Royal Astronomical Society, vol. 453, no. 3, Oxford
University Press, 2015, pp. 2465–70, doi:10.1093/mnras/stv1795.'
short: A. Pallottini, A. Ferrara, F. Pacucci, S. Gallerani, S. Salvadori, R. Schneider,
D. Schaerer, D. Sobral, J.J. Matthee, Monthly Notices of the Royal Astronomical
Society 453 (2015) 2465–2470.
date_created: 2022-07-14T08:58:36Z
date_published: 2015-11-01T00:00:00Z
date_updated: 2022-08-19T08:19:23Z
day: '01'
doi: 10.1093/mnras/stv1795
extern: '1'
external_id:
arxiv:
- '1506.07173'
intvolume: ' 453'
issue: '3'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- black hole physics
- 'stars: Population III'
- 'galaxies: high-redshift'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1506.07173
month: '11'
oa: 1
oa_version: Preprint
page: 2465-2470
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'The brightest Lyα emitter: Pop III or black hole?'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 453
year: '2015'
...
---
_id: '11668'
abstract:
- lang: eng
text: "We study multiple keyword sponsored search auctions with budgets. Each keyword
has multiple ad slots with a click-through rate. The bidders have additive valuations,
which are linear in the click-through rates, and budgets, which are restricting
their overall payments. Additionally, the number of slots per keyword assigned
to a bidder is bounded.\r\n\r\nWe show the following results: (1) We give the
first mechanism for multiple keywords, where click-through rates differ among
slots. Our mechanism is incentive compatible in expectation, individually rational
in expectation, and Pareto optimal. (2) We study the combinatorial setting, where
each bidder is only interested in a subset of the keywords. We give an incentive
compatible, individually rational, Pareto-optimal, and deterministic mechanism
for identical click-through rates. (3) We give an impossibility result for incentive
compatible, individually rational, Pareto-optimal, and deterministic mechanisms
for bidders with diminishing marginal valuations."
article_number: '2'
article_processing_charge: No
article_type: original
author:
- first_name: Riccardo
full_name: Colini-Baldeschi, Riccardo
last_name: Colini-Baldeschi
- first_name: Stefano
full_name: Leonardi, Stefano
last_name: Leonardi
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Martin
full_name: Starnberger, Martin
last_name: Starnberger
citation:
ama: Colini-Baldeschi R, Leonardi S, Henzinger MH, Starnberger M. On multiple keyword
sponsored search auctions with budgets. ACM Transactions on Economics and Computation.
2015;4(1). doi:10.1145/2818357
apa: Colini-Baldeschi, R., Leonardi, S., Henzinger, M. H., & Starnberger, M.
(2015). On multiple keyword sponsored search auctions with budgets. ACM Transactions
on Economics and Computation. Association for Computing Machinery. https://doi.org/10.1145/2818357
chicago: Colini-Baldeschi, Riccardo, Stefano Leonardi, Monika H Henzinger, and Martin
Starnberger. “On Multiple Keyword Sponsored Search Auctions with Budgets.” ACM
Transactions on Economics and Computation. Association for Computing Machinery,
2015. https://doi.org/10.1145/2818357.
ieee: R. Colini-Baldeschi, S. Leonardi, M. H. Henzinger, and M. Starnberger, “On
multiple keyword sponsored search auctions with budgets,” ACM Transactions
on Economics and Computation, vol. 4, no. 1. Association for Computing Machinery,
2015.
ista: Colini-Baldeschi R, Leonardi S, Henzinger MH, Starnberger M. 2015. On multiple
keyword sponsored search auctions with budgets. ACM Transactions on Economics
and Computation. 4(1), 2.
mla: Colini-Baldeschi, Riccardo, et al. “On Multiple Keyword Sponsored Search Auctions
with Budgets.” ACM Transactions on Economics and Computation, vol. 4, no.
1, 2, Association for Computing Machinery, 2015, doi:10.1145/2818357.
short: R. Colini-Baldeschi, S. Leonardi, M.H. Henzinger, M. Starnberger, ACM Transactions
on Economics and Computation 4 (2015).
date_created: 2022-07-27T11:54:56Z
date_published: 2015-12-05T00:00:00Z
date_updated: 2023-02-09T10:03:35Z
day: '05'
doi: 10.1145/2818357
extern: '1'
intvolume: ' 4'
issue: '1'
keyword:
- Algorithms
- Economics
- Clinching ascending auction
- auctions with budgets
- Sponsored search auctions
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://eprints.cs.univie.ac.at/3510/
month: '12'
oa: 1
oa_version: Submitted Version
publication: ACM Transactions on Economics and Computation
publication_identifier:
eissn:
- 2167-8383
issn:
- 2167-8375
publication_status: published
publisher: Association for Computing Machinery
quality_controlled: '1'
scopus_import: '1'
status: public
title: On multiple keyword sponsored search auctions with budgets
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 4
year: '2015'
...
---
_id: '11669'
abstract:
- lang: eng
text: We study individual rational, Pareto-optimal, and incentive compatible mechanisms
for auctions with heterogeneous items and budget limits. We consider settings
with multiunit demand and additive valuations. For single-dimensional valuations
we prove a positive result for randomized mechanisms, and a negative result for
deterministic mechanisms. While the positive result allows for private budgets,
the negative result is for public budgets. For multidimensional valuations and
public budgets we prove an impossibility result that applies to deterministic
and randomized mechanisms. Taken together this shows the power of randomization
in certain settings with heterogeneous items, but it also shows its limitations.
article_number: '4'
article_processing_charge: No
article_type: original
author:
- first_name: Paul
full_name: Dütting, Paul
last_name: Dütting
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Martin
full_name: Starnberger, Martin
last_name: Starnberger
citation:
ama: Dütting P, Henzinger MH, Starnberger M. Auctions for heterogeneous items and
budget limits. ACM Transactions on Economics and Computation. 2015;4(1).
doi:10.1145/2818351
apa: Dütting, P., Henzinger, M. H., & Starnberger, M. (2015). Auctions for heterogeneous
items and budget limits. ACM Transactions on Economics and Computation.
Association for Computing Machinery. https://doi.org/10.1145/2818351
chicago: Dütting, Paul, Monika H Henzinger, and Martin Starnberger. “Auctions for
Heterogeneous Items and Budget Limits.” ACM Transactions on Economics and Computation.
Association for Computing Machinery, 2015. https://doi.org/10.1145/2818351.
ieee: P. Dütting, M. H. Henzinger, and M. Starnberger, “Auctions for heterogeneous
items and budget limits,” ACM Transactions on Economics and Computation,
vol. 4, no. 1. Association for Computing Machinery, 2015.
ista: Dütting P, Henzinger MH, Starnberger M. 2015. Auctions for heterogeneous items
and budget limits. ACM Transactions on Economics and Computation. 4(1), 4.
mla: Dütting, Paul, et al. “Auctions for Heterogeneous Items and Budget Limits.”
ACM Transactions on Economics and Computation, vol. 4, no. 1, 4, Association
for Computing Machinery, 2015, doi:10.1145/2818351.
short: P. Dütting, M.H. Henzinger, M. Starnberger, ACM Transactions on Economics
and Computation 4 (2015).
date_created: 2022-07-27T12:09:15Z
date_published: 2015-12-05T00:00:00Z
date_updated: 2022-09-09T12:08:37Z
day: '05'
doi: 10.1145/2818351
extern: '1'
external_id:
arxiv:
- '1209.6448'
intvolume: ' 4'
issue: '1'
keyword:
- Algorithmic game theory
- auction theory
- Clinching auction
- Pareto optimality
- Budget limits
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1209.6448
month: '12'
oa: 1
oa_version: Preprint
publication: ACM Transactions on Economics and Computation
publication_identifier:
eissn:
- 2167-8383
issn:
- 2167-8375
publication_status: published
publisher: Association for Computing Machinery
quality_controlled: '1'
scopus_import: '1'
status: public
title: Auctions for heterogeneous items and budget limits
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 4
year: '2015'
...
---
_id: '11670'
abstract:
- lang: eng
text: Auctions are widely used on the Web. Applications range from sponsored search
to platforms such as eBay. In these and in many other applications the auctions
in use are single-/multi-item auctions with unit demand. The main drawback of
standard mechanisms for this type of auctions, such as VCG and GSP, is the limited
expressiveness that they offer to the bidders. The General Auction Mechanism (GAM)
of Aggarwal et al. [2009] takes a first step toward addressing the problem of
limited expressiveness by computing a bidder optimal, envy-free outcome for linear
utility functions with identical slopes and a single discontinuity per bidder-item
pair. We show that in many practical situations this does not suffice to adequately
model the preferences of the bidders, and we overcome this problem by presenting
the first mechanism for piecewise linear utility functions with nonidentical slopes
and multiple discontinuities. Our mechanism runs in polynomial time. Like GAM
it is incentive compatible for inputs that fulfill a certain nondegeneracy assumption,
but our requirement is more general than the requirement of GAM. For discontinuous
utility functions that are nondegenerate as well as for continuous utility functions
the outcome of our mechanism is a competitive equilibrium. We also show how our
mechanism can be used to compute approximately bidder optimal, envy-free outcomes
for a general class of continuous utility functions via piecewise linear approximation.
Finally, we prove hardness results for even more expressive settings.
acknowledgement: We would like to thank Veronika Loitzenbauer and the anonymous referees
for their valuable feedback.
article_number: '1'
article_processing_charge: No
article_type: original
author:
- first_name: Paul
full_name: Dütting, Paul
last_name: Dütting
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Ingmar
full_name: Weber, Ingmar
last_name: Weber
citation:
ama: Dütting P, Henzinger MH, Weber I. An expressive mechanism for auctions on the
web. ACM Transactions on Economics and Computation. 2015;4(1). doi:10.1145/2716312
apa: Dütting, P., Henzinger, M. H., & Weber, I. (2015). An expressive mechanism
for auctions on the web. ACM Transactions on Economics and Computation.
Association for Computing Machinery. https://doi.org/10.1145/2716312
chicago: Dütting, Paul, Monika H Henzinger, and Ingmar Weber. “An Expressive Mechanism
for Auctions on the Web.” ACM Transactions on Economics and Computation.
Association for Computing Machinery, 2015. https://doi.org/10.1145/2716312.
ieee: P. Dütting, M. H. Henzinger, and I. Weber, “An expressive mechanism for auctions
on the web,” ACM Transactions on Economics and Computation, vol. 4, no.
1. Association for Computing Machinery, 2015.
ista: Dütting P, Henzinger MH, Weber I. 2015. An expressive mechanism for auctions
on the web. ACM Transactions on Economics and Computation. 4(1), 1.
mla: Dütting, Paul, et al. “An Expressive Mechanism for Auctions on the Web.” ACM
Transactions on Economics and Computation, vol. 4, no. 1, 1, Association for
Computing Machinery, 2015, doi:10.1145/2716312.
short: P. Dütting, M.H. Henzinger, I. Weber, ACM Transactions on Economics and Computation
4 (2015).
date_created: 2022-07-27T12:43:18Z
date_published: 2015-12-02T00:00:00Z
date_updated: 2023-02-09T10:08:41Z
day: '02'
doi: 10.1145/2716312
extern: '1'
intvolume: ' 4'
issue: '1'
keyword:
- Computational Mathematics
- Marketing
- Economics and Econometrics
- Statistics and Probability
- Computer Science (miscellaneous)
language:
- iso: eng
month: '12'
oa_version: None
publication: ACM Transactions on Economics and Computation
publication_identifier:
eissn:
- 2167-8383
issn:
- 2167-8375
publication_status: published
publisher: Association for Computing Machinery
quality_controlled: '1'
scopus_import: '1'
status: public
title: An expressive mechanism for auctions on the web
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 4
year: '2015'
...
---
_id: '11774'
abstract:
- lang: eng
text: "Combinatorial auctions (CA) are a well-studied area in algorithmic mechanism
design. However, contrary to the standard model, empirical studies suggest that
a bidder’s valuation often does not depend solely on the goods assigned to him.
For instance, in adwords auctions an advertiser might not want his ads to be displayed
next to his competitors’ ads. In this paper, we propose and analyze several natural
graph-theoretic models that incorporate such negative externalities, in which
bidders form a directed conflict graph with maximum out-degree Δ. We design algorithms
and truthful mechanisms for social welfare maximization that attain approximation
ratios depending on Δ.\r\n\r\nFor CA, our results are twofold: (1) A lottery that
eliminates conflicts by discarding bidders/items independent of the bids. It allows
to apply any truthful \U0001D6FC-approximation mechanism for conflict-free valuations
and yields an \U0001D4AA(\U0001D6FCΔ)-approximation mechanism. (2) For fractionally
sub-additive valuations, we design a rounding algorithm via a novel combination
of a semi-definite program and a linear program, resulting in a cone program;
the approximation ratio is \U0001D4AA((ΔloglogΔ)/logΔ). The ratios are almost
optimal given existing hardness results.\r\n\r\nFor adwords auctions, we present
several algorithms for the most relevant scenario when the number of items is
small. In particular, we design a truthful mechanism with approximation ratio
\U0001D45C(Δ) when the number of items is only logarithmic in the number of bidders."
alternative_title:
- LNCS
article_processing_charge: No
author:
- first_name: Yun Kuen
full_name: Cheung, Yun Kuen
last_name: Cheung
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Martin
full_name: Hoefer, Martin
last_name: Hoefer
- first_name: Martin
full_name: Starnberger, Martin
last_name: Starnberger
citation:
ama: 'Cheung YK, Henzinger MH, Hoefer M, Starnberger M. Combinatorial auctions with
conflict-based externalities. In: 11th International Conference on Web and
Internet Economics. Vol 9470. Springer Nature; 2015:230–243. doi:10.1007/978-3-662-48995-6_17'
apa: 'Cheung, Y. K., Henzinger, M. H., Hoefer, M., & Starnberger, M. (2015).
Combinatorial auctions with conflict-based externalities. In 11th International
Conference on Web and Internet Economics (Vol. 9470, pp. 230–243). Amsterdam,
Netherlands: Springer Nature. https://doi.org/10.1007/978-3-662-48995-6_17'
chicago: Cheung, Yun Kuen, Monika H Henzinger, Martin Hoefer, and Martin Starnberger.
“Combinatorial Auctions with Conflict-Based Externalities.” In 11th International
Conference on Web and Internet Economics, 9470:230–243. Springer Nature, 2015.
https://doi.org/10.1007/978-3-662-48995-6_17.
ieee: Y. K. Cheung, M. H. Henzinger, M. Hoefer, and M. Starnberger, “Combinatorial
auctions with conflict-based externalities,” in 11th International Conference
on Web and Internet Economics, Amsterdam, Netherlands, 2015, vol. 9470, pp.
230–243.
ista: 'Cheung YK, Henzinger MH, Hoefer M, Starnberger M. 2015. Combinatorial auctions
with conflict-based externalities. 11th International Conference on Web and Internet
Economics. WINE: International Conference on Web and Internet Economics, LNCS,
vol. 9470, 230–243.'
mla: Cheung, Yun Kuen, et al. “Combinatorial Auctions with Conflict-Based Externalities.”
11th International Conference on Web and Internet Economics, vol. 9470,
Springer Nature, 2015, pp. 230–243, doi:10.1007/978-3-662-48995-6_17.
short: Y.K. Cheung, M.H. Henzinger, M. Hoefer, M. Starnberger, in:, 11th International
Conference on Web and Internet Economics, Springer Nature, 2015, pp. 230–243.
conference:
end_date: 2015-12-12
location: Amsterdam, Netherlands
name: 'WINE: International Conference on Web and Internet Economics'
start_date: 2015-12-09
date_created: 2022-08-08T13:54:32Z
date_published: 2015-12-09T00:00:00Z
date_updated: 2023-02-10T09:08:30Z
day: '09'
doi: 10.1007/978-3-662-48995-6_17
extern: '1'
external_id:
arxiv:
- '1509.09147'
intvolume: ' 9470'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.1509.09147
month: '12'
oa: 1
oa_version: Preprint
page: 230–243
publication: 11th International Conference on Web and Internet Economics
publication_identifier:
eisbn:
- '9783662489956'
isbn:
- '9783662489949'
issn:
- 0302-9743
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Combinatorial auctions with conflict-based externalities
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 9470
year: '2015'
...
---
_id: '11773'
abstract:
- lang: eng
text: "Ad exchanges are an emerging platform for trading advertisement slots on
the web with billions of dollars revenue per year. Every time a user visits a
web page, the publisher of that web page can ask an ad exchange to auction off
the ad slots on this page to determine which advertisements are shown at which
price. Due to the high volume of traffic, ad networks typically act as mediators
for individual advertisers at ad exchanges. If multiple advertisers in an ad network
are interested in the ad slots of the same auction, the ad network might use a
“local” auction to resell the obtained ad slots among its advertisers.\r\n\r\nIn
this work we want to deepen the theoretical understanding of these new markets
by analyzing them from the viewpoint of combinatorial auctions. Prior work studied
mostly single-item auctions, while we allow the advertisers to express richer
preferences over multiple items. We develop a game-theoretic model for the entanglement
of the central auction at the ad exchange with the local auctions at the ad networks.
We consider the incentives of all three involved parties and suggest a three-party
competitive equilibrium, an extension of the Walrasian equilibrium that ensures
envy-freeness for all participants. We show the existence of a three-party competitive
equilibrium and a polynomial-time algorithm to find one for gross-substitute bidder
valuations."
alternative_title:
- LNCS
article_processing_charge: No
author:
- first_name: Oren
full_name: Ben-Zwi, Oren
last_name: Ben-Zwi
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Veronika
full_name: Loitzenbauer, Veronika
last_name: Loitzenbauer
citation:
ama: 'Ben-Zwi O, Henzinger MH, Loitzenbauer V. Ad exchange: Envy-free auctions with
mediators. In: 11th International Conference on Web and Internet Economics.
Vol 9470. Springer Nature; 2015:104–117. doi:10.1007/978-3-662-48995-6_8'
apa: 'Ben-Zwi, O., Henzinger, M. H., & Loitzenbauer, V. (2015). Ad exchange:
Envy-free auctions with mediators. In 11th International Conference on Web
and Internet Economics (Vol. 9470, pp. 104–117). Amsterdam, Netherlands: Springer
Nature. https://doi.org/10.1007/978-3-662-48995-6_8'
chicago: 'Ben-Zwi, Oren, Monika H Henzinger, and Veronika Loitzenbauer. “Ad Exchange:
Envy-Free Auctions with Mediators.” In 11th International Conference on Web
and Internet Economics, 9470:104–117. Springer Nature, 2015. https://doi.org/10.1007/978-3-662-48995-6_8.'
ieee: 'O. Ben-Zwi, M. H. Henzinger, and V. Loitzenbauer, “Ad exchange: Envy-free
auctions with mediators,” in 11th International Conference on Web and Internet
Economics, Amsterdam, Netherlands, 2015, vol. 9470, pp. 104–117.'
ista: 'Ben-Zwi O, Henzinger MH, Loitzenbauer V. 2015. Ad exchange: Envy-free auctions
with mediators. 11th International Conference on Web and Internet Economics. WINE:
International Conference on Web and Internet Economics, LNCS, vol. 9470, 104–117.'
mla: 'Ben-Zwi, Oren, et al. “Ad Exchange: Envy-Free Auctions with Mediators.” 11th
International Conference on Web and Internet Economics, vol. 9470, Springer
Nature, 2015, pp. 104–117, doi:10.1007/978-3-662-48995-6_8.'
short: O. Ben-Zwi, M.H. Henzinger, V. Loitzenbauer, in:, 11th International Conference
on Web and Internet Economics, Springer Nature, 2015, pp. 104–117.
conference:
end_date: 2015-09-12
location: Amsterdam, Netherlands
name: 'WINE: International Conference on Web and Internet Economics'
start_date: 2015-09-09
date_created: 2022-08-08T13:33:56Z
date_published: 2015-12-09T00:00:00Z
date_updated: 2023-02-10T09:06:23Z
day: '09'
doi: 10.1007/978-3-662-48995-6_8
extern: '1'
external_id:
arxiv:
- '1604.05562'
intvolume: ' 9470'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.1604.05562
month: '12'
oa: 1
oa_version: Preprint
page: 104–117
publication: 11th International Conference on Web and Internet Economics
publication_identifier:
eisbn:
- '9783662489956'
isbn:
- '9783662489949'
issn:
- 0302-9743
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Ad exchange: Envy-free auctions with mediators'
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 9470
year: '2015'
...