THE PAN-STARRS1 MEDIUM-DEEP SURVEY: THE ROLE OF GALAXY GROUP ENVIRONMENT IN THE STAR FORMATION RATE VERSUS STELLAR MASS RELATION AND QUIESCENT FRACTION OUT TO z ∼ 0.8

Using a large optically selected sample of field and group galaxies drawn from the Pan-STARRS1 Medium-Deep Survey (PS1/MDS), we present a detailed analysis of the specific star formation rate (SSFR)-stellar mass (M sub(*)) relation, as well as the quiescent fraction versus M sub(*) relation in diffe...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 782; no. 1; pp. 1 - 16
Main Authors LIN, LIHWAI, Jian, Hung-Yu, Foucaud, Sebastien, Norberg, Peder, Bower, R G, Cole, Shaun, Arnalte-Mur, Pablo, Chen, Chin-Wei, COUPON, JEAN, HSIEH, BAU-CHING
Format Journal Article
LanguageEnglish
Published United States 10.02.2014
Subjects
AMPLITUDES
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DENSITY
EFFICIENCY
EVOLUTION
GALAXIES
MASS
QUENCHING
RED SHIFT
REDUCTION
Slopes
Star formation
Star formation rate
STARS
Stellar mass
UNIVERSE
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Summary:Using a large optically selected sample of field and group galaxies drawn from the Pan-STARRS1 Medium-Deep Survey (PS1/MDS), we present a detailed analysis of the specific star formation rate (SSFR)-stellar mass (M sub(*)) relation, as well as the quiescent fraction versus M sub(*) relation in different environments. Using this large galaxy sample, we confirm that the fraction of quiescent galaxies is strongly dependent on environment at a fixed stellar mass, but that the amplitude and the slope of the star-forming sequence is similar between the field and groups: in other words, the SSFR-density relation at a fixed stellar mass is primarily driven by the change in the star-forming and quiescent fractions between different environments rather than a global suppression in the star formation rate for the star-forming population.
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content type line 23
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/782/1/33