Paola Oliva-Altamirano (Swinburne University/Australian Astronomical Observatory)

Brightest Cluster Galaxies as probes of galaxy formation
When Oct 28, 2014 from 02:00 PM to 03:00 PM
  • Special Seminar
  • Colloquium
Where SH, Seminar Room
Add event to calendar vCal / iCal

Brightest group and cluster galaxies (BGGs/BCGs) are old giant ellipticals, which have been show to be different from any other cluster galaxy. Despite of being easy detectable their formation and evolution is still poorly understood. I will present a statistical analysis of a large sample of 883 Brightest group and cluster galaxies (BGGs/BCGs) from the Galaxy and Mass Assembly Survey (GAMA). We analyse their stellar mass growth, position in the cluster, and the percentage of BGGs/BCGs that show H\alpha in emission. We find that BCGs grow steeply until z~0.5, and slow down at lower redshift.

BCGs have been predicted to have a more active accretion history than less massive galaxies. We further use IFU spectroscopy to study the spatially-resolved stellar populations of BCGs and their connection with galaxy's angular momentum. We find that all the BCGs in our sample have gone through at least one major merger after z=1. Our stellar population analysis suggest that BCGs have a more active accretion history than early-type galaxies of similar mass.