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Evolution of galaxies and their environments at z = 0.1-3 in COSMOS

Scoville, N.; Arnouts, S.; Aussel, H.; Benson, A.; Bongiorno, A.; Bundy, K.; Calvo, M.A.A.; Capak, P.; Carollo, M.; Civano, F.; Dunlop, J.; Elvis, M.; Faisst, A.; Finoguenov, A.; Fu, H.; Giavalisco, M.; Guo, Q.; Ilbert, O.; Iovino, A.; Kajisawa, M.; Kartaltepe, J.; Leauthaud, A.; Le Fèvre, O.; LeFloch, E.; Lilly, S.J.; Liu, C.T.-C.; Manohar, S.; Massey, R.; Masters, D.; McCracken, H.J.; Mobasher, B.; Peng, Y.-J.; Renzini, A.; Rhodes, J.; Salvato, M.; Sanders, D.B.; Sarvestani, B.D.; Scarlata, C.; Schinnerer, E.; Sheth, K.; Shopbell, P.L.; Smolčić, V.; Taniguchi, Y.; Taylor, J.E.; White, S.D.M.; Yan, L.

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Authors

N. Scoville

S. Arnouts

H. Aussel

A. Benson

A. Bongiorno

K. Bundy

M.A.A. Calvo

P. Capak

M. Carollo

F. Civano

J. Dunlop

M. Elvis

A. Faisst

A. Finoguenov

H. Fu

M. Giavalisco

Q. Guo

O. Ilbert

A. Iovino

M. Kajisawa

J. Kartaltepe

A. Leauthaud

O. Le Fèvre

E. LeFloch

S.J. Lilly

C.T.-C. Liu

S. Manohar

D. Masters

H.J. McCracken

B. Mobasher

Y.-J. Peng

A. Renzini

J. Rhodes

M. Salvato

D.B. Sanders

B.D. Sarvestani

C. Scarlata

E. Schinnerer

K. Sheth

P.L. Shopbell

V. Smolčić

Y. Taniguchi

J.E. Taylor

S.D.M. White

L. Yan



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 Ks -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 ΛCDM 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 ~ 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.

Citation

Scoville, N., Arnouts, S., Aussel, H., Benson, A., Bongiorno, A., Bundy, K., …Yan, L. (2013). Evolution of galaxies and their environments at z = 0.1-3 in COSMOS. Astrophysical Journal Supplement, 206(1), Article 3. https://doi.org/10.1088/0067-0049/206/1/3

Journal Article Type Article
Publication Date May 1, 2013
Deposit Date Jun 30, 2014
Publicly Available Date Aug 19, 2014
Journal Astrophysical Journal Supplement
Print ISSN 0067-0049
Electronic ISSN 1538-4365
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 206
Issue 1
Article Number 3
DOI https://doi.org/10.1088/0067-0049/206/1/3
Keywords Galaxies: evolution, Large-scale structure of universe.

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Copyright Statement
© 2013. The American Astronomical Society. All rights reserved.





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