The Role of Environment and AGN in the build-up of red galaxy population

Abstract：
How bulge-dominated (early-type) galaxies form is a long-standing puzzle in the field of galaxy formation and evolution. Recent luminosity function studies have suggested that the abundance of them have grown by at least a factor of two from z 1 to z 0. We investigate the role of environment and AGN in the build-up of this red-sequence population by focusing on the transitional galaxies --- post-starburst galaxies, using data from SDSS survey in the local universe and DEEP2 survey at z 1. We discovered that a surprisingly large fraction of post-starburst galaxies and red-sequence galaxies host an AGN. We also found post-starburst galaxies are preferentially found in low-density environment, which resembles their progenitors --- star-forming galaxies. The implications of these studies on the quenching mechanisms of star formation will be discussed.

Nov 4th, 2008 (Tuesday) 10:00am NAOC Seminar Room A408,
welcome to attend!