The VLA-COSMOS 3 GHz Large Project : Evolution of Specific Star Formation Rates out to z similar to 5

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Leslie , S , Schinnerer , E , Liu , D , Magnelli , B , Algera , H , Karim , A , Davidzon , I , Gozaliasl , G , Jimenez-Andrade , E F , Lang , P , Sargent , M , Novak , M , Groves , B , Smolcic , V , Zamorani , G , Vaccari , M , Battisti , A , Vardoulaki , E , Peng , Y & Kartaltepe , J 2020 , ' The VLA-COSMOS 3 GHz Large Project : Evolution of Specific Star Formation Rates out to z similar to 5 ' , Astrophysical Journal , vol. 899 , no. 1 , 58 . https://doi.org/10.3847/1538-4357/aba044

Title: The VLA-COSMOS 3 GHz Large Project : Evolution of Specific Star Formation Rates out to z similar to 5
Author: Leslie, Sarah; Schinnerer, Eva; Liu, Daizhong; Magnelli, Benjamin; Algera, Hiddo; Karim, Alexander; Davidzon, Iary; Gozaliasl, Ghassem; Jimenez-Andrade, Eric F.; Lang, Philipp; Sargent, Mark; Novak, Mladen; Groves, Brent; Smolcic, Vernesa; Zamorani, Giovanni; Vaccari, Mattia; Battisti, Andrew; Vardoulaki, Eleni; Peng, Yingjie; Kartaltepe, Jeyhan
Contributor: University of Helsinki, Department of Physics
Date: 2020-08
Number of pages: 37
Belongs to series: Astrophysical Journal
ISSN: 0004-637X
URI: http://hdl.handle.net/10138/320393
Abstract: We provide a coherent, uniform measurement of the evolution of the logarithmic star formation rate (SFR)-stellar mass (M-*) relation, called the main sequence (MS) of star-forming galaxies, for star-forming and all galaxies out to z similar to 5. We measure the MS using mean stacks of 3 GHz radio-continuum images to derive average SFRs for similar to 200,000 mass-selected galaxies at z > 0.3 in the COSMOS field. We describe the MS relation by adopting a new model that incorporates a linear relation at low stellar mass (log(M-*/M-circle dot) <10) and a flattening at high stellar mass that becomes more prominent at low redshift (z <1.5). We find that the SFR density peaks at 1.5 <z <2, and at each epoch there is a characteristic stellar mass (M-* = 1-4 x 10(10)M(circle dot)) that contributes the most to the overall SFR density. This characteristic mass increases with redshift, at least to z similar to 2.5. We find no significant evidence for variations in the MS relation for galaxies in different environments traced by the galaxy number density at 0.3 <z <3, nor for galaxies in X-ray groups at z similar to 0.75. We confirm that massive bulge-dominated galaxies have lower SFRs than disk-dominated galaxies at a fixed stellar mass at z <1.2. As a consequence, the increase in bulge-dominated galaxies in the local star-forming population leads to a flattening of the MS at high stellar masses. This indicates that "mass quenching" is linked with changes in the morphological composition of galaxies at a fixed stellar mass.
Subject: ULTRAVIOLET LUMINOSITY DENSITY
FRANCE REDSHIFT SURVEY
LYMAN-BREAK GALAXIES
M-ASTERISK RELATION
LESS-THAN 2
STELLAR MASS
FORMING GALAXIES
MAIN-SEQUENCE
FORMATION HISTORY
INTERSTELLAR-MEDIUM
115 Astronomy, Space science
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