The evolution of star formation activity in galaxy groups

G. Erfanianfar, P. Popesso, A. Finoguenov, S. Wuyts, D. Wilman, A. Biviano, F. Ziparo, M. Salvato, K. Nandra, D. Lutz, D. Elbaz, M. Dickinson, M. Tanaka, M. Mirkazemi, M. L. Balogh, M. B. Altieri, H. Aussel, F. Bauer, S. Berta, R. M. BielbyN. Brandt, N. Cappelluti, A. Cimatti, M. Cooper, D. Fadda, O. Ilbert, E. Le Floch, B. Magnelli, J. S. Mulchaey, R. Nordon, J. A. Newman, A. Poglitsch, F. Pozzi

Research output: Contribution to journalArticlepeer-review

15 Citations (SciVal)
117 Downloads (Pure)


We study the evolution of the total star formation (SF) activity, total stellar mass (ΣM*) and halo occupation distribution (HOD) in massive haloes by using one of the largest X-ray selected sample of galaxy groups with secure spectroscopic identification in the major blank field surveys (ECDFS, CDFN, COSMOS, AEGIS). We provide an accurate measurement of star formation rate (SFR) for the bulk of the star-forming galaxies using very deep mid-infrared Spitzer MIPS and far-infrared Herschel PACS observations. For undetected IR sources, we provide a well-calibrated SFR from spectral energy distribution (SED) fitting. We observe a clear evolution in the level of SF activity in galaxy groups. The total SF activity in the high-redshift groups (0.5 < z < 1.1) is higher with respect to the low-redshift (0.15 < z < 0.5) sample at any mass by 0.8 ± 0.12 dex. A milder difference (0.35 ± 0.1 dex) is observed between the low-redshift bin and the groups at z ∼ 0. We show that the level of SF activity is declining more rapidly in the more massive haloes than in the more common lower mass haloes. We do not observe any evolution in the HOD and total stellar mass–halo mass relations in groups. The picture emerging from our findings suggests that the galaxy population in the most massive systems is evolving faster than galaxies in lower mass haloes, consistently with a ‘halo downsizing’ scenario.
Original languageEnglish
Pages (from-to)2725-2745
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date20 Oct 2014
Publication statusPublished - 1 Dec 2014


  • catalogues
  • galaxies: evolution
  • Cosmology: observations
  • large-scale structure of Universe
  • infrared: galaxies


Dive into the research topics of 'The evolution of star formation activity in galaxy groups'. Together they form a unique fingerprint.

Cite this