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Article: The Taiwan ECDFS near-infrared survey: very bright end of the luminosity function at z > 7

TitleThe Taiwan ECDFS near-infrared survey: very bright end of the luminosity function at z > 7
Authors
KeywordsGalaxies: evolution
Galaxies: formation
Galaxies: high-redshift
Issue Date2012
PublisherInstitute of Physics Publishing, Inc.
Citation
The Astrophysical Journal, 2012, v. 749 n. 1, article no. 88 How to Cite?
AbstractThe primary goal of the Taiwan ECDFS Near-Infrared Survey (TENIS) is to find well-screened galaxy candidates at z > 7 (z′ dropout) in the Extended Chandra Deep Field-South (ECDFS). To this end, TENIS provides relatively deep J and K s data (∼25.3 ABmag, 5σ) for an area of 0.5 × 0.5 deg. Leveraged with existing data at mid-infrared to optical wavelengths, this allows us to screen for the most luminous high-z objects, which are rare and thus require a survey over a large field to be found. We introduce new color selection criteria to select a z > 7 sample with minimal contaminations from low-z galaxies and Galactic cool stars; to reduce confusion in the relatively low angular resolution Infrared Array Camera (IRAC) images, we introduce a novel deconvolution method to measure the IRAC fluxes of individual sources. Illustrating perhaps the effectiveness at which we screen out interlopers, we find only one z > 7 candidate, TENIS-ZD1. The candidate has a weighted z phot of 7.8, and its colors and luminosity indicate a young (45M years old) starburst galaxy with a stellar mass of 3.2 × 10 10 M ⊙. The result matches with the observational luminosity function analysis and the semianalytic simulation result based on the Millennium Simulations, which may over predict the volume density for high-z massive galaxies. The existence of TENIS-ZD1, if confirmed spectroscopically to be at z > 7, therefore poses a challenge to current theoretical models for how so much mass can accumulate in a galaxy at such a high redshift. © 2012. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/146415
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
Funding AgencyGrant Number
National Science Council of Taiwan98-2112-M-001-003-MY2
99-2112-M-001-012-MY3
Japanese Government FIRST
Funding Information:

We thank the referee for comments that greatly improved the manuscript. We are grateful to the CFHT staff for their help obtaining the data, and H. K. C. Yee and Y. T. Lin for useful discussions. This paper is based on observations obtained with the WIRCam, a joint project of CFHT, Taiwan, Korea, Canada, France, and the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institute National des Sciences de l'Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii. Access to the CFHT was made possible by the Ministry of Education, the National Science Council of Taiwan as part of the Cosmology and Particle Astrophysics (CosPA), the Institute of Astronomy and Astrophysics, Academia Sinica, and National Tsing Hua University, Taiwan. We gratefully acknowledge support from the National Science Council of Taiwan Grant 98-2112-M-001-003-MY2 (W.H.W.), 99-2112-M-001-012-MY3 (W.H.W), and Japanese Government FIRST program (H.K.).

References

 

DC FieldValueLanguage
dc.contributor.authorHsieh, BCen_HK
dc.contributor.authorWang, WHen_HK
dc.contributor.authorYan, Hen_HK
dc.contributor.authorLin, Len_HK
dc.contributor.authorKaroji, Hen_HK
dc.contributor.authorLim, Jen_HK
dc.contributor.authorHo, PTPen_HK
dc.contributor.authorTsai, CWen_HK
dc.date.accessioned2012-04-24T07:52:15Z-
dc.date.available2012-04-24T07:52:15Z-
dc.date.issued2012en_HK
dc.identifier.citationThe Astrophysical Journal, 2012, v. 749 n. 1, article no. 88en_HK
dc.identifier.issn0004-637Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/146415-
dc.description.abstractThe primary goal of the Taiwan ECDFS Near-Infrared Survey (TENIS) is to find well-screened galaxy candidates at z > 7 (z′ dropout) in the Extended Chandra Deep Field-South (ECDFS). To this end, TENIS provides relatively deep J and K s data (∼25.3 ABmag, 5σ) for an area of 0.5 × 0.5 deg. Leveraged with existing data at mid-infrared to optical wavelengths, this allows us to screen for the most luminous high-z objects, which are rare and thus require a survey over a large field to be found. We introduce new color selection criteria to select a z > 7 sample with minimal contaminations from low-z galaxies and Galactic cool stars; to reduce confusion in the relatively low angular resolution Infrared Array Camera (IRAC) images, we introduce a novel deconvolution method to measure the IRAC fluxes of individual sources. Illustrating perhaps the effectiveness at which we screen out interlopers, we find only one z > 7 candidate, TENIS-ZD1. The candidate has a weighted z phot of 7.8, and its colors and luminosity indicate a young (45M years old) starburst galaxy with a stellar mass of 3.2 × 10 10 M ⊙. The result matches with the observational luminosity function analysis and the semianalytic simulation result based on the Millennium Simulations, which may over predict the volume density for high-z massive galaxies. The existence of TENIS-ZD1, if confirmed spectroscopically to be at z > 7, therefore poses a challenge to current theoretical models for how so much mass can accumulate in a galaxy at such a high redshift. © 2012. The American Astronomical Society. All rights reserved.en_HK
dc.languageengen_US
dc.publisherInstitute of Physics Publishing, Inc.en_HK
dc.relation.ispartofThe Astrophysical Journalen_HK
dc.rightsThe Astrophysical Journal. Copyright © Institute of Physics Publishing, Inc.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectGalaxies: evolutionen_HK
dc.subjectGalaxies: formationen_HK
dc.subjectGalaxies: high-redshiften_HK
dc.titleThe Taiwan ECDFS near-infrared survey: very bright end of the luminosity function at z > 7en_HK
dc.typeArticleen_HK
dc.identifier.emailLim, J: jjlim@hku.hken_HK
dc.identifier.authorityLim, J=rp00745en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1088/0004-637X/749/1/88en_HK
dc.identifier.scopuseid_2-s2.0-84859130355en_HK
dc.identifier.hkuros199374en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84859130355&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume749en_HK
dc.identifier.issue1en_HK
dc.identifier.eissn1538-4357-
dc.identifier.isiWOS:000302175500088-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridTsai, CW=36663120700en_HK
dc.identifier.scopusauthoridHo, PTP=55152569000en_HK
dc.identifier.scopusauthoridLim, J=7403453870en_HK
dc.identifier.scopusauthoridKaroji, H=6602816566en_HK
dc.identifier.scopusauthoridLin, L=35313961500en_HK
dc.identifier.scopusauthoridYan, H=7403396077en_HK
dc.identifier.scopusauthoridWang, WH=55154096400en_HK
dc.identifier.scopusauthoridHsieh, BC=37053806800en_HK

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