Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21721304a&link_type=abstract
American Astronomical Society, AAS Meeting #217, #213.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
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. We present results from a study of AGN and star-formation in 8 low-redshift galaxy clusters. We construct spectral energy distributions (SEDs) from visible and MIR observations of cluster galaxies and fit model SEDs to the observed fluxes. 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. AGN can also be identified from their model SEDs. The AGN selected by these two techniques are largely disjoint: only 8 out of 44 AGN are identified in X-rays and from their model SEDs. We find a positive correlation between SFR and radius within the host cluster, consistent with the SFR--density relation, but there is no apparent correlation between radius and accretion rate. However, the relationship between AGN accretion and host star-formation in cluster AGN hosts does not significantly differ from the relationship shown by z≈0.8 field AGNs and their hosts. Since SFR correlates with radius, field galaxies at z=0 must have larger SFRs relative to their black hole growth than field galaxies at z≈0.8. This is consistent with evolution in the MBH--Mbulge relation. We also measure the fractions of cluster members with star-formation and AGN to determine the AGN duty cycle in star-forming galaxies. At time of writing, results are pending. I am grateful to The Ohio State University and the Spitzer grant program for supporting this work.
Atlee David Wesley
Martini Paul
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