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Title

The DEEP2 galaxy redshift survey: evolution of the colour-density relation at 0.4 < z < 1.35

Author(s)

Cooper, Michael C.;  Newman, Jeffery A.;  Coil, Alison L.;  Croton, Darren J.;  Gerke, Brian F.;  Yan, Renbin;  Davis, Marc;  Faber, S. M.;  Guhathakurta, Puragra;  Koo, David C.;  Weiner, Benjamin J.;  Willmer, Christopher N. A.

Abstract

Using a sample of 19 464 galaxies drawn from the DEEP2 Galaxy Redshift Survey, we study the relationship between galaxy colour and environment at 0.4 < z < 1.35 . We find that the fraction of galaxies on the red sequence depends strongly on local environment out to z > 1 , being larger in regions of greater galaxy density. At all epochs probed, we also find a small population of red, morphologically early-type galaxies residing in regions of low measured overdensity. The observed correlations between the red fraction and local overdensity are highly significant, with the trend at z > 1 detected at a greater than 5σ level. Over the entire redshift regime studied, we find that the colour–density relation evolves continuously, with red galaxies more strongly favouring overdense regions at low z relative to their red-sequence counterparts at high redshift. At z≳ 1.3 , the red fraction only weakly correlates with overdensity, implying that any colour dependence to the clustering of ∼L* galaxies at that epoch must be small. Our findings add weight to existing evidence that the build-up of galaxies on the red sequence has occurred preferentially in overdense environments (i.e. galaxy groups) at z≲ 1.5 . Furthermore, we identify the epoch (z∼ 2) at which typical ∼L* galaxies began quenching and moved on to the red sequence in significant number. The strength of the observed evolutionary trends at 0 < z < 1.35 suggests that the correlations observed locally, such as the morphology–density and colour–density relations, are the result of environment-driven mechanisms (i.e. 'nurture') and do not appear to have been imprinted (by 'nature') upon the galaxy population during their epoch of formation.

Publication type

Journal article

Source

Monthly Notices of the Royal Astronomical Society, Vol. 376, no. 4 (Apr 2007), pp. 1445-1459

Publication year

2007

FOR Code(s)

0201 Astronomical and Space Sciences

Keyword(s)

Galaxy evolution;  Fundamental parameters;  High-redshift galaxies;  Large-scale structure of universe

Publisher

Wiley-Blackwell

ISSN

0035-8711

Publisher URL

http://dx.doi.org/10.1111/j.1365-2966.2007.11534.x

Copyright

Copyright © 2007 The Authors. Journal compilation copyright © 2007 Royal Astronomical Society. Accepted manuscript reproduced here in accordance with the copyright policy of the publisher. The definitive publication is available at www.interscience.wiley.com.

Full text

Peer reviewed