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The galaxy stellar mass function of X-ray detected groups. Environmental dependence of galaxy evolution in the COSMOS survey

Giodini, S. and Finoguenov, A. and Pierini, D. and Zamorani, G. and Ilbert, O. and Lilly, S. and Peng, Y. and Scoville, N. and Tanaka, M. (2012) The galaxy stellar mass function of X-ray detected groups. Environmental dependence of galaxy evolution in the COSMOS survey. Astronomy and Astrophysics, 538 . Art. No. A104. ISSN 0004-6361. doi:10.1051/0004-6361/201117696.

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We study the stellar mass distribution for galaxies in 160 X-ray detected groups of 10^(13) < Log(M_(200)/M_⊙) < 2 × 10^(14) and compare it with that of galaxies in the field to investigate the action of environment on the build-up of the stellar mass. We highlight differences in the build-up of the passive population in the field, which imprint features in the distribution of stellar mass of passive galaxies at Log(M/M_⊙) < 10.5. The gradual diminishing of the effect when moving to groups of increasing total masses indicates that the growing influence of the environment in bound structures is responsible for the build-up of a quenched component at Log(M/M_⊙) < 10.5. Differently, the stellar mass distribution of star-forming galaxies is similar in shape in all environments, and can be described by a single Schechter function both in groups and in the field. Little evolution is seen up to redshift 1. Nevertheless at z = 0.2–0.4 groups with M_(200) < 6 × 10^(13) M_⊙ (low-mass groups) tend to have a characteristic mass for star-forming galaxies that is 50% higher than in higher mass groups; we interpret it as a reduced action of environmental processes in these systems. Furthermore, we analyse the distribution of sSFR–Log(M) in groups and in the field, and find that groups show on average a lower sSFR (by ~0.2 dex) at z < 0.8. Accordingly, we find that the fraction of star-forming galaxies is increasing with redshift in all environments, but at a faster pace in the denser ones. Finally, our analysis highlights that low-mass groups have a higher fraction (by 50%) of the stellar mass locked in star-forming galaxies than higher mass systems (i.e. 2/3 of their stellar mass).

Item Type:Article
Related URLs:
URLURL TypeDescription
Finoguenov, A.0000-0002-4606-5403
Ilbert, O.0000-0002-7303-4397
Lilly, S.0000-0002-6423-3597
Scoville, N.0000-0002-0438-3323
Tanaka, M.0000-0002-5011-5178
Additional Information:© 2012 ESO. Received 14 July 2011. Accepted 24 November 2011. Published online 13 February 2012. S.G. acknowledges support from The Netherlands Organization for Scientific Research (NWO) through a VIDI grant. We acknowledge the contributions of the entire COSMOS collaboration; more informations on the COSMOS survey are available at S.G. acknowledge H. Boehringer for having contributed to the start of this project and H. Hoekstra, G. Guzzo, J. Brinchmann, S. Weinmann, D. Capozzi, T. Ponman, B. Vulcani and A. Leauthaud for helpful discussion. D.P. acknowledges the kind hospitality of the MPE.
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Subject Keywords:galaxies: groups: general
Record Number:CaltechAUTHORS:20120403-073218005
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Official Citation:The galaxy stellar mass function of X-ray detected groups - Environmental dependence of galaxy evolution in the COSMOS survey S. Giodini, A. Finoguenov, D. Pierini, G. Zamorani, O. Ilbert, S. Lilly, Y. Peng, N. Scoville and M. Tanaka A&A 538 A104 (2012) DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29942
Deposited On:03 Apr 2012 14:58
Last Modified:09 Nov 2021 19:33

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