Image of Alice in Wonderland at the Mad Hatter's tea party You are cordially invited to afternoon tea and biscuits wine and chocolate

Astronomy Tea Talks at Caltech

Mondays, Hameetman auditorium (Cahill)
Tea:  4.00pm
Talk: 4.15pm

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2010 - 2011 season:
7 Feb 2011 David Atlee (OSU)

'The AGN-Starburst Connection in Low Redshift Galaxy Clusters from Multiwavelength Data'

Clusters of galaxies have long been used as laboratories for the study of galaxy evolution because the processes that impact morphology and star-formation rates (SFRs) in dense environments occur most rapidly in clusters. I present results from a study of AGN and star-formation in 8 low-redshift galaxy clusters. I will show spectral energy distributions (SEDs) constructed from visible and MIR observations of cluster galaxies and the models used to fit them. These fits measure stellar masses and SFRs of the cluster members, which we use to predict the X-ray luminosity of each cluster member. X-ray luminosities in excess of the predictions indicate the presence of an AGN, which can also be identified based on the shapes of their SEDs. I will compare the two classes of AGN and discuss the properties of their host galaxies. I also examine the duty cycle of AGN in galaxy clusters, which indicates that typical black holes in galaxy clusters are not growing significantly with respect to their host galaxies at z = 0. Finally, I measure the relationship between star-formation, accretion and environment within clusters, which is consistent with earlier work on the SFR-density relation, and argue that we need suites of cosmological, hydrodynamic simulations of galaxy evolution in clusters.
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Last modified on 20th Jul 2011 by Dominik A. Riechers.  

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