1302.2562 (Angus Mok et al.)

Efficient satellite quenching at z~1 from the GEEC2 spectroscopic survey of galaxy groups    [PDF]

Angus Mok, Michael L. Balogh, Sean L. McGee, David J. Wilman, Alexis Finoguenov, Masayuki Tanaka, Stefania Giodini, Richard G. Bower, Jennifer L. Connelly, Annie Hou, John S. Mulchaey, Laura C. Parker

We present deep GMOS-S spectroscopy for 11 galaxy groups at 0.866%) for eight of the eleven groups. Using an optical-NIR colour-colour diagram, the galaxies in the sample were separated with a dust insensitive method into three categories: passive (red), star-forming (blue), and intermediate (green). The strongest environmental dependence is observed in the fraction of passive galaxies, which make up only ~20 per cent of the field in the mass range 10^{10.3}View original: http://arxiv.org/abs/1302.2562