Keck Deep Fields. IV. Luminosity-dependent clustering and galaxy downsizing in UV-selected galaxies at z = 4, 3, and 2

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dc.creator Savoy, Jonathan
dc.creator Sawicki, Marcin, 1969-
dc.creator Thompson, David
dc.creator Sato, Taro
dc.date.accessioned 2015-10-09T13:02:59Z
dc.date.available 2015-10-09T13:02:59Z
dc.date.issued 2011-08-20
dc.identifier.issn 0004-637X
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/26409
dc.description Publisher's version/PDF en_CA
dc.description.abstract We investigate the luminosity-dependent clustering of rest-frame UV-selected galaxies at z ∼ 4, 3, 2.2, and 1.7 in the Keck Deep Fields, which are complete to R = 27 and cover 169 arcmin[superscript 2]. We find that at z ∼ 4 and 3, UV-bright galaxies cluster more strongly than UV-faint ones, but at z ∼ 2.2 and 1.7, the UV-bright galaxies are no longer the most strongly clustered. We derive mass estimates for objects in our sample by comparing our measurements to the predicted clustering of dark matter halos in the Millennium Simulation. From these estimates, we infer relationships between halo mass and star formation rate (SFR), and find that the most massive dark matter halos in our sample host galaxies with high SFRs (M[subscript 1700] < −20, or >50 M[subscript circled dot] yr[superscript −1]) at z ∼ 3 and 4, moderate SFRs (−20 < M[subscript 1700] < −19, or ∼20 M[subscript circled dot] yr[superscript −1]) at z ∼ 2.2, and lower SFRs (−19 < M[subscript 1700] < −18, or ∼2 M[subscript circled dot] yr[superscript −1]) at z ∼ 1.7. We believe our measurements may provide a new line of evidence for galaxy downsizing by extending that concept from stellar to halo mass. We also find that the objects with blue UV colors in our sample are much more strongly clustered than those with red UV colors, and we propose that this may be due to the presence of the 2175 [Angstrom] dust absorption bump in more massive halos, which contain the older stellar populations and dust needed to produce the feature. The relatively small area covered by the survey means that the absolute values of the correlation lengths and halo masses we derive are heavily dependent on the “integral constraint” correction, but the uniformly deep coverage across a large-redshift interval allows us to detect several important trends that are independent of this correction. en_CA
dc.language.iso en en_CA
dc.publisher American Astronomical Society en_CA
dc.publisher IOP Publishing
dc.relation.uri http://dx.doi.org/10.1088/0004-637X/737/2/92
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Galaxies -- Clusters
dc.subject.lcsh Stars -- Formation
dc.subject.lcsh Galaxies -- Formation
dc.subject.lcsh Galaxies -- Evolution
dc.title Keck Deep Fields. IV. Luminosity-dependent clustering and galaxy downsizing in UV-selected galaxies at z = 4, 3, and 2 en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astrophysical Journal 737(2), 92. (2011) en_CA


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Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: http://dx.doi.org/10.1088/0004-637X/737/2/92
 
 

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