The evolution of the star formation activity per halo mass up to redshift similar to 1.6 as seen by Herschel
- Autor(en)
- Paola Popesso, Andrea Biviano, Giulia Rodighiero, Helmut Dannerbauer
- Abstrakt
Aims. Star formation in massive galaxies is quenched at some point during hierarchical mass assembly. To understand where and when the quenching processes takes place, we study the evolution of the total star formation rate per unit total halo mass (Sigma(SFR)/M) in three different mass scales: low mass halos (field galaxies), groups, and clusters, up to a redshift z approximate to 1.6.
Methods. We use deep far-infrared PACS data at 100 and 160 mu m to accurately estimate the total star formation rate of the luminous infrared galaxy population of 9 clusters with mass similar to 10(15) M-circle dot, and 9 groups/poor clusters with mass similar to 5 x 10(13) M-circle dot. Estimates of the field Sigma(SFR)/M are derived from the literature, by dividing the star formation rate density by the mean comoving matter density of the universe.
Results. The field Sigma(SFR)/M increases with redshift up to z similar to 1 and it is constant thereafter. The evolution of the Sigma(SFR)/M-z relation in galaxy systems is much faster than in the field. Up to redshift z similar to 0.2, the field has a higher Sigma(SFR)/M than galaxy groups and galaxy clusters. At higher redshifts, galaxy groups and the field have similar Sigma(SFR)/M, while massive clusters have significantly lower Sigma(SFR)/M than both groups and the field. There is a hint of a reversal of the SFR activity vs. environment at z similar to 1.6, where the group Sigma(SFR)/M lies above the field Sigma(SFR)/M-z relation. We discuss possible interpretations of our results in terms of the processes of downsizing, and star-formation quenching.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Max-Planck-Institut für extraterrestrische Physik, INAF Astronomical Observatory of Triest, Università degli Studi di Padova
- Journal
- Astronomy & Astrophysics
- Band
- 537
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/201117973
- Publikationsdatum
- 2012
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103004 Astrophysik
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/4b4e74e0-f90f-4b11-aa36-5dd82355f229