EVOLUTION OF GALAXIES AND THEIR ENVIRONMENTS AT z = 0.1-3 IN COSMOS

N Scoville; A Benson; Hai Fu; S Arnouts; H Aussel; A Bongiorno; K Bundy; M. A. A Calvo; P Capak; M Carollo; A Faisst; F Civano; M Elvis; J Dunlop; A Finoguenov; Q Guo; M Giavalisco; O Ilbert; A Iovino; M Kajisawa

doi:10.1088/0067-0049/206/1/3

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Journal article

EVOLUTION OF GALAXIES AND THEIR ENVIRONMENTS AT z = 0.1-3 IN COSMOS

N Scoville, A Benson, Hai Fu, S Arnouts, H Aussel, A Bongiorno, K Bundy, M. A. A Calvo, P Capak, M Carollo, …

The Astrophysical journal. Supplement series, Vol.206(1), pp.1-26

05/01/2013

DOI: 10.1088/0067-0049/206/1/3

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Abstract

Large-scale structures (LSSs) out to z < 3.0 are measured in the Cosmic Evolution Survey (COSMOS) using extremely accurate photometric redshifts (photoz). The K{sub s} -band-selected sample (from Ultra-Vista) is comprised of 155,954 galaxies. Two techniques-adaptive smoothing and Voronoi tessellation-are used to estimate the environmental densities within 127 redshift slices. Approximately 250 statistically significant overdense structures are identified out to z = 3.0 with shapes varying from elongated filamentary structures to more circularly symmetric concentrations. We also compare the densities derived for COSMOS with those based on semi-analytic predictions for a {Lambda}CDM simulation and find excellent overall agreement between the mean densities as a function of redshift and the range of densities. The galaxy properties (stellar mass, spectral energy distributions (SEDs), and star formation rates (SFRs)) are strongly correlated with environmental density and redshift, particularly at z < 1.0-1.2. Classifying the spectral type of each galaxy using the rest-frame b - i color (from the photoz SED fitting), we find a strong correlation of early-type galaxies (E-Sa) with high-density environments, while the degree of environmental segregation varies systematically with redshift out to z {approx} 1.3. In the highest density regions, 80% of the galaxies are early types at z = 0.2 compared to only 20% at z = 1.5. The SFRs and the star formation timescales exhibit clear environmental correlations. At z > 0.8, the SFR density is uniformly distributed over all environmental density percentiles, while at lower redshifts the dominant contribution is shifted to galaxies in lower density environments.

APPROXIMATIONS

ASTROPHYSICS, COSMOLOGY AND ASTRONOMY

COLOR MODEL

COMPARATIVE EVALUATIONS

CORRELATIONS

DENSITY

GALACTIC EVOLUTION

GALAXIES

RED SHIFT

SIMULATION

STARS

UNIVERSE

Details

Title: Subtitle: EVOLUTION OF GALAXIES AND THEIR ENVIRONMENTS AT z = 0.1-3 IN COSMOS
Creators: N Scoville - California Institute of Technology
A Benson - California Institute of Technology
Hai Fu - California Institute of Technology
S Arnouts - Aix-Marseille University
H Aussel - Université Paris Cité
A Bongiorno - INAF
K Bundy - The University of Tokyo
M. A. A Calvo - Johns Hopkins University
P Capak - California Institute of Technology
M Carollo - ETH Zurich
A Faisst - ETH Zurich
F Civano - Harvard University
M Elvis - Harvard University
J Dunlop - University of Edinburgh
A Finoguenov - Max Planck Society
Q Guo - Max Planck Society
M Giavalisco - University of Massachusetts Amherst
O Ilbert - Laboratoire d’Astrophysique de Marseille
A Iovino - INAF
M Kajisawa - Ehime University
Resource Type: Journal article
Publication Details: The Astrophysical journal. Supplement series, Vol.206(1), pp.1-26
DOI: 10.1088/0067-0049/206/1/3
ISSN: 0067-0049
eISSN: 1538-4365
Language: English
Date published: 05/01/2013
Academic Unit: Physics and Astronomy
Record Identifier: 9984200037302771

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