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

Brightest Cluster Galaxies as probes of galaxy formation
Wann Am 28.10.2014 von 14:00 bis 15:00
Was
  • Special Seminar
  • Kolloquium
Wo SH, Seminarraum
Termin übernehmen 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.