Non-linearity and environmental dependence of the star-forming galaxies main sequence

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

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Using data from four deep fields (COSMOS, AEGIS, ECDFS, and CDFN), we study the correlation between the position of galaxies in the star formation rate (SFR) versus stellar mass plane and local environment at z <1.1. To accurately estimate the galaxy SFR, we use the deepest available Spitzer/MIPS 24 and Herschel/PACS data sets. We distinguish group environments (Mhalo ~ 1012.5-14.2M⊙) based on the available deep X-ray data and lower halo mass environments based on the local galaxy density.We confirm that the main sequence (MS) of star-forming galaxies is not a linear relation and there is a flattening towards higher stellar masses (M* > 1010.4-10.6 M⊙), across all environments. At high redshift (0.5 <z10.4-1010.6M⊙) stellar mass, morphology and environment act together in driving the evolution of the star formation activity towards lower level. The presence of a dominating bulge and the associated quenching processes are already in place beyond z ~1. The environmental effects appear, instead, at lower redshifts and have a long time-scale.

Original languageEnglish
Pages (from-to)2839-2851
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date25 Nov 2015
Publication statusPublished - 21 Jan 2016


  • Galaxies: groups: general
  • Galaxies: haloes
  • Galaxies: star formation
  • Galaxy: evolution
  • Galaxy: structure
  • Infrared: galaxies


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