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Title:
The DEEP2 Galaxy Redshift Survey: the relationship between galaxy properties and environment at z ~ 1
Authors:
Cooper, Michael C.; Newman, Jeffrey A.; Croton, Darren J.; Weiner, Benjamin J.; Willmer, Christopher N. A.; Gerke, Brian F.; Madgwick, Darren S.; Faber, S. M.; Davis, Marc; Coil, Alison L.; Finkbeiner, Douglas P.; Guhathakurta, Puragra; Koo, David C.
Affiliation:
AA(Department of Astronomy, University of California at Berkeley, Mail Code 3411, Berkeley, CA 94720, USA), AB(Lawrence Berkeley National Laboratory, 1 Cyclotron Road Mail Stop 50-208, Berkeley, CA 94720, USA), AC(Department of Astronomy, University of California at Berkeley, Mail Code 3411, Berkeley, CA 94720, USA), AD(UCO/Lick Observatory, UC Santa Cruz, Santa Cruz, CA 95064, USA), AE(UCO/Lick Observatory, UC Santa Cruz, Santa Cruz, CA 95064, USA), AF(Department of Physics, University of California at Berkeley, Mail Code 7300, Berkeley, CA 94720, USA), AG(Lawrence Berkeley National Laboratory, 1 Cyclotron Road Mail Stop 50-208, Berkeley, CA 94720, USA), AH(UCO/Lick Observatory, UC Santa Cruz, Santa Cruz, CA 95064, USA), AI(Department of Astronomy, University of California at Berkeley, Mail Code 3411, Berkeley, CA 94720, USA; Steward Observatory, University of Arizona, 933 N. Cherry Avenue, Tucson, AZ 85721, USA), AJ(Steward Observatory, University of Arizona, 933 N. Cherry Avenue, Tucson, AZ 85721, USA), AK(Princeton University Observatory, Princeton, NJ 08544, USA), AL(UCO/Lick Observatory, UC Santa Cruz, Santa Cruz, CA 95064, USA), AM(UCO/Lick Observatory, UC Santa Cruz, Santa Cruz, CA 95064, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 370, Issue 1, pp. 198-212. (MNRAS Homepage)
Publication Date:
07/2006
Origin:
MNRAS
MNRAS Keywords:
galaxies: evolution: galaxies: fundamental parameters: galaxies: high-redshift: galaxies: statistics: large-scale structure of Universe, galaxies: evolution, galaxies: fundamental parameters, galaxies: high-redshift, galaxies: statistics, large-scale structure of Universe
DOI:
10.1111/j.1365-2966.2006.10485.x
Bibliographic Code:
2006MNRAS.370..198C

Abstract

We study the mean environment of galaxies in the DEEP2 Galaxy Redshift Survey as a function of rest-frame colour, luminosity, and [OII] 3727Å equivalent width. The local galaxy overdensity for >14000 galaxies at 0.75 < z < 1.35 is estimated using the projected third-nearest-neighbour surface density. Of the galaxy properties studied, mean environment is found to depend most strongly on galaxy colour; all major features of the correlation between mean overdensity and rest-frame colour observed in the local universe were already in place at z ~ 1. In contrast to local results, we find a substantial slope in the mean dependence of environment on luminosity for blue, star forming galaxies at z ~ 1, with brighter blue galaxies being found on average in regions of greater overdensity. We discuss the roles of galaxy clusters and groups in establishing the observed correlations between environment and galaxy properties at high redshift, and we also explore the evidence for a `downsizing of quenching' from z ~ 1 to ~0. Our results add weight to existing evidence that the mechanism(s) that result in star formation quenching are efficient in group environments as well as clusters. This work is the first of its kind at high redshift and represents the first in a series of papers addressing the role of environment in galaxy formation at 0 < z < 1.

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