Unveiling a Population of Hidden AGN in Clusters of Galaxies

Details Unveiling a Population of Hidden AGN in Clusters of Galaxies Unveiling a Population of Hidden AGN in Clusters of Galaxies

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50096m&link_type=abstract

Spitzer Proposal ID #50096

Physics

Scientific paper

We have conducted an X-ray and visible-wavelength study of eight clusters of galaxies and measured an unexpectedly high AGN fraction of 5 percent, or approximately five times higher than previous estimates. However, these AGN classifications remain uncertain because all but four are based on X-ray luminosity and flux ratios as the galaxies lack the classical, visible-wavelength emission-lines characteristic of AGN. We propose Spitzer IRAC and 24micron MIPS photometry of our AGN candidates to determine if they are genuine AGN based on evidence for hot dust emission in the infrared. We will also use these observations to determine if these AGN lack visible-wavelength emission lines because they are intrinsically optically dull, or if they are heavily obscured. A previously hidden AGN population in clusters of galaxies has many interesting implications for AGN fueling, feedback, and black hole growth in rich environments, while the nature of these X-ray bright but optically normal galaxies make them cluster analogs of the faint field AGN uncovered with Spitzer and Chandra.

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