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, M. Tanaka

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


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).

Original languageEnglish
Article numberA104
JournalAstronomy and Astrophysics
Publication statusPublished - 2012
Externally publishedYes


  • galaxies: groups: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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