The Study Of The Satellite Quenching Efficiency At Redshifts Z<1

Galaxy quenching refers to ceasing of star formation in galaxy clusters, which is important to understand the evolution of galaxies. Previous works show that galaxy quenching is affected by processes which can be broadly divided as “internal” and “external” mechanisms. The former means processes heating or blowing away of the interstellar gas triggered by internal structures such as AGN feedback or bulge growth; while the latter one refers to mechanisms influenced by surrounding environments that prevent external gas falling in galaxies and cooling down. It has been know that the satellite galaxies are affected more remarkably by external mechanisms comparing to central ones in galaxies groups and clusters. Recent results base on color classification of galaxies indicate that the efficiency of galaxy quenching for satellite galaxies is about 0.5 from near universe to z~0.8. However, color classification for galaxies may be affected by dust extinction, which make galaxies looks redder.In this work, we select a galaxy sample from the DEEP2/AEGIS group catalog in Gerke et al. with redshift range 0.4<z<1, in conjunction with a sample of nearby galaxies(0.02<z<0.07) selected from the Yang et al. derived with SDSS DR7, to re-visiting the environment effect satellite quenching out to z=1.We show that, for galaxies with mass 10.2 <log(M/ M) <10.8, the quiescent fraction of satellite and central galaxies increase with redshift decreasing, and the quiescent fraction of satellite galaxies is systematically higher than that of centrals at all redshifts. These results are consistant with the classification. Nevertheless, the fraction of quiescent galaxies selected from the SFR-mass relation is about 30% lower than that from the color-mass relation on average, which means a significant lower quenching efficiency by about 40%.Our results suggest that the effect of the group environment on quenching massive satellite galaxies is important out to z=1, but not as remarkably as previous findings based on color-mass relations.