Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733512k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #335.12; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
In recent years, multi-wavelength look-back surveys revealed how galaxies build up their stellar mass and how their star formation rates (SFRs) evolve probing a wide range of redshift. The panchromatic datasets of the COSMOS field, in particular, has provided very accurate photometric redshifts and stellar masses for an unprecedentedly rich mass-selected sample of galaxies. Stacking these data into the VLA-COSMOS 1.4 GHz map we have determined the average SFR of galaxies as a function of stellar mass unbiased from dust/extinction effects and source confusion due to the 1.5" angular resolution achieved by the VLA. We confirm the existence of a power-law relation between specific SFR (SSFR) and stellar mass for star forming galaxies out to z=3. While higher mass systems exhibit lower SSFRs at any epoch NO differential, more rapid evolution of high mass galaxies is evident. We describe the mass-independent temporal evolution of the SSFR by a simple power-law (1+z)n. Utilizing measured mass functions of star forming systems, the characteristic stellar mass for galaxies contributing most to the comoving SFR density does not appear to evolve with cosmic time. Our data presents the to-date best determination of the cosmic star formation history since z 3.
A central implicit assumption of this work is the validity of the radio-IR relation at all relevant redshifts. By considering Spitzer/MIPS 24 and 70mm data for the same sample of galaxies we were able to show that radio- and IR-based derived SFRs are in good agreement.
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