Program: GS-2010A-Q-22

Title:The transition of galaxy groups from an invigorating environment to a suffocating one
PI:Michael Balogh
Co-I(s): Sean McGee, Laura Parker, Richard Bower, John Mulchaey, Alexis Finoguenov, Dave Wilman, Jennifer Connelly

Abstract

At low redshift, galaxy groups are hostile environments, gradually shutting down star formation activity, but at z=1 there is evidence that groups actually induce star formation in massive galaxies. While much can be learned about this important process from wide-field, sparsely sampled redshift surveys, a complementary and necessary approach is to study a smaller, pure sample of groups in detail. Only then is it possible to robustly measure the group mass, centre and radius, and the group-to-group variations predicted by simple infall models. We propose to continue a 3 semester programme begun in 09A, to study galaxies in 16 groups at 0.8<z<1, selected from ultradeep X-ray observations. With the available data we will be able to measure the dynamical mass, stellar mass fraction, star formation rate, and the fraction of "evolved" galaxies in these systems.

Publications using this program's data