Differential evolution of the UV luminosity function of Lyman break galaxies from z ~ 5 to 3

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dc.creator Iwata, I.
dc.creator Ohta, K.
dc.creator Tamura, N.
dc.creator Akiyama, M.
dc.creator Aoki, K.
dc.creator Ando, M.
dc.creator Kiuchi, G.
dc.creator Sawicki, Marcin, 1969-
dc.date.accessioned 2015-09-10T13:21:18Z
dc.date.available 2015-09-10T13:21:18Z
dc.date.issued 2007
dc.identifier.issn 1365-2966
dc.identifier.issn 0035-8711
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/26303
dc.description Publisher's version/PDF en_CA
dc.description.abstract We report the ultraviolet luminosity function (UVLF) of Lyman break galaxies at z∼5 derived from a deep and wide survey using the prime focus camera of the 8.2 m Subaru telescope (Suprime-Cam). Target fields consist of two blank regions of the sky, namely, the region including the Hubble Deep Field-North and the J0053+1234 region, and the total effective surveyed area is 1290 arcmin[superscript 2]. Applications of carefully determined colour selection criteria in V−I[subscript c] and I[subscript c]−z′ yield a detection of 853 z ∼ 5 candidates with z′[subscript AB] [less than] 26.5 mag. The UVLF at z ∼ 5 based on this sample shows no significant change in the number density of bright (L [greater than or similar to] L[subscript z=3) LBGs from that at z ∼ 3, while there is a significant decline in the LF’s faint end with increasing look-back time. This result means that the evolution of the number densities is differential with UV luminosity: the number density of UV luminous objects remains almost constant from z ∼ 5 to 3 (the cosmic age is about 1.2 to 2.1 Gyr) while the number density of fainter objects gradually increases with cosmic time. This trend becomes apparent thanks to the small uncertainties in number densities both in the bright and faint parts of LFs at different epochs that are made possible by the deep and wide surveys we use.We discuss the origins of this differential evolution of the UVLF along the cosmic time and suggest that our observational findings are consistent with the biased galaxy evolution scenario: a galaxy population hosted by massive dark haloes starts active star formation preferentially at early cosmic time, while less massive galaxies increase their number density later. We also calculated the UV luminosity density by integrating the UVLF and at z ∼ 5 found it to be 38.8[superscript +6.7][subscript −4.1] per cent of that at z ∼ 3 for the luminosity range L [greater than] 0.1L[subscript z=3]. By combining our results with those from the literature, we find that the cosmic UV luminosity density marks its peak at z = 2–3 and then slowly declines towards higher redshift. en_CA
dc.description.provenance Submitted by Janine Mills (janine.mills@smu.ca) on 2015-09-10T13:21:18Z No. of bitstreams: 1 Sawicki_Marcin_article_2007.pdf: 2947313 bytes, checksum: 2e7dd18b9d2d61648e2eead8a2afe5fd (MD5) en
dc.description.provenance Made available in DSpace on 2015-09-10T13:21:18Z (GMT). No. of bitstreams: 1 Sawicki_Marcin_article_2007.pdf: 2947313 bytes, checksum: 2e7dd18b9d2d61648e2eead8a2afe5fd (MD5) Previous issue date: 2007 en
dc.language.iso en en_CA
dc.publisher Royal Astronomical Society en_CA
dc.publisher Oxford University Press
dc.relation.uri http://dx.doi.org/10.1111/j.1365-2966.2007.11557.x
dc.rights This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2007 The Authors, ©: 2007 RAS. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.subject.lcsh Galaxies -- Evolution
dc.subject.lcsh Galaxies -- Formation
dc.subject.lcsh Red shift
dc.title Differential evolution of the UV luminosity function of Lyman break galaxies from z ~ 5 to 3 en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Monthly Notices of the Royal Astronomical Society 376(4), 1557-1576. (2007) en_CA
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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2007 The Authors, ©: 2007 RAS. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
 
Published Version: http://dx.doi.org/10.1111/j.1365-2966.2007.11557.x
 
 

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