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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 606557.0, MPI für Astronomie / Publikationen_mpia
A Constant Characteristic Mass for Star Forming Galaxies since z-3 Revealed by Radio Emission in the COSMOS Field
Authors:Karim, A.; Schinnerer, E.; Lu, J.; Luo, Z.; Yang, Z.; Hua, H.; Chen, Z.
Date of Publication (YYYY-MM-DD):2011
Title of Proceedings:Galaxy Evolution: Infrared to Millimeter Wavelength Perspective
Start Page:269
End Page:274
Volume (in Series):446
Name of Conference/Meeting:Galaxy Evolution: Infrared to Millimeter Wavelength Perspective
Audience:Not Specified
Abstract / Description:We present results of our 1.4 GHz image stacking analysis of mass-selected galaxies in the COSMOS field. From the resulting median radio continuum flux density we have determined the evolution of the average star formation rate (SFR) of galaxies as a function of stellar mass, unbiased from effects of dust but also source confusion due to the 1.5" angular resolution achieved by the VLA. We find 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 at least out to zËœ1.5 where our conclusions are most robust. Utilizing measured mass functions of star forming systems, the characteristic stellar mass for galaxies contributing most to the comoving SFR density appears not to evolve. These findings hence challenge ‘downsizing’ scenarios in which star formation has gradually shifted towards lower mass systems with cosmic time. Our analysis constitutes the to-date best determination of the cosmic star formation history (CSFH) since z = 3 and yields indirect evidence for a rapid decline of the global mass density of molecular gas with time.
Comment of the Author/Creator:Date: 2011, October 1, 2011
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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