Details

Autor(en) / Beteiligte

• Darvish, Behnam
• Mobasher, Bahram
• Sobral, David
• Rettura, Alessandro
• Scoville, Nick
• Faisst, Andreas
• Capak, Peter

Titel

THE EFFECTS OF THE LOCAL ENVIRONMENT AND STELLAR MASS ON GALAXY QUENCHING TO z ∼ 3

Ist Teil von

• The Astrophysical journal, 2016-07, Vol.825 (2), p.113-113

Ort / Verlag

United States: The American Astronomical Society

Erscheinungsjahr

2016

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• ABSTRACT We study the effects of the local environment and stellar mass on galaxy properties using a mass complete sample of quiescent and star-forming systems in the COSMOS field at . We show that at the median star formation rate (SFR) and specific SFR (sSFR) of all galaxies depend on the environment, but they become independent of the environment at z 1. However, we find that only for star-forming galaxies, the median SFR and sSFR are similar in different environments regardless of redshift and stellar mass. We find that the quiescent fraction depends on the environment at z 1 and on stellar mass out to z ∼ 3. We show that at z 1 galaxies become quiescent faster in denser environments and that the overall environmental quenching efficiency increases with cosmic time. Environmental and mass quenching processes depend on each other. At z 1 denser environments more efficiently quench galaxies with higher masses (log( ) 10.7), possibly due to a higher merger rate of massive galaxies in denser environments. We also show that mass quenching is more efficient in denser regions. We show that the overall mass quenching efficiency ( ) for more massive galaxies (log( ) 10.2) rises with cosmic time until z ∼ 1 and then flattens out. However, for less massive galaxies, the rise in continues to the present time. Our results suggest that environmental quenching is only relevant at z 1 and is likely a fast process, whereas mass quenching is the dominant mechanism at z 1 with a possible stellar feedback physics.