The Evolution of the Galaxy Mass Assembly and Star Formation Activity as a Function of Environment

Event Date: 

Wednesday, April 3, 2013 - 4:00pm

Event Location: 

  • Broida 3302

Astrophysics Seminar


Benedetta Vulcani (IPMU)

Distinguishing the separate contributions of environmental versus in situ processes is critical to understanding galaxy evolution. Observational studies have had increasing success quantifying the role of environment and mass in shaping galaxy properties. I will show how star formation rates and morphological fractions depend both on mass and environment. However, it is yet not clear how they are related. I will show that the observed galaxy stellar mass function is very similar in the field, groups and clusters and its evolution with time (from z=0.6 to 0) does not depend on environment. In contrast, the mass function does depend on local density, both in clusters and in the field, both at high and low-z. The nature of these discrepancies can provide valuable insight into the processes regulating mass growth in the universe.