The numbers of z ∼ 2 star-forming and passive galaxies in 2.5 square degrees of deep CFHT imaging

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dc.creator Arcila-Osejo, Liz
dc.creator Sawicki, Marcin, 1969-
dc.date.accessioned 2016-01-11T15:01:13Z
dc.date.available 2016-01-11T15:01:13Z
dc.date.issued 2013-08-19
dc.identifier.issn 1365-2966
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/26445
dc.description Publisher's version/PDF en_CA
dc.description.abstract We use an adaptation of the BzK[subscript s] technique to select ∼40 000 z ∼ 2 galaxies (to K[subscript AB] = 24), including ∼5000 passively evolving (PE) objects (to K[subscript AB] = 23), from 2.5 deg[superscript 2] of deep Canada–France–Hawaii Telescope (CFHT) imaging. The passive galaxy luminosity function (LF) exhibits a clear peak at R = 22 and a declining faint-end slope ([alpha] = −0.12[superscript +0.16][subscript −0.14), while that of star-forming galaxies is characterized by a steep faint-end slope [[alpha] = −1.43 [plus or minus] 0.02(systematic)[superscript +0.05][subscript −0.04](random)]. The details of the LFs are somewhat sensitive (at the [less than]25 per cent level) to cosmic variance even in these large (∼0.5 deg[superscript 2]) fields, with the D2 field (located in the Cosmological Evolution Survey, COSMOS field) most discrepant from the mean. The shape of the z ∼ 2 stellar mass function of passive galaxies is remarkably similar to that at z ∼ 0.9, save for a factor of ∼4 lower number density. This similarity suggests that the same mechanism may be responsible for the formation of passive galaxies seen at both these epochs. This same formation mechanism may also operate down to z ∼ 0 if the local PE galaxy mass function, known to be two-component, contains two distinct galaxy populations. This scenario is qualitatively in agreement with recent phenomenological mass-quenching models and extends them to span more than three quarters of the history of the Universe. en_CA
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dc.description.provenance Made available in DSpace on 2016-01-11T15:01:13Z (GMT). No. of bitstreams: 1 Sawicki_Marcin_article_2013.pdf: 2550981 bytes, checksum: 5b4c762b98e2d52f29435bb34a975be5 (MD5) Previous issue date: 2013-08-19 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/10.1093/mnras/stt1354
dc.rights This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors. 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.title The numbers of z ∼ 2 star-forming and passive galaxies in 2.5 square degrees of deep CFHT imaging en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Monthly Notices of the Royal Astronomical Society 435(1), 845-860. (2013) en_CA
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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
 
Published Version: http://dx.doi.org/10.1093/mnras/stt1354
 
 

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