Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50416d&link_type=abstract
Spitzer Proposal ID #50416
Computer Science
Scientific paper
Feedback from active galactic nuclei at the centers of galaxies clusters has become crucial to our understanding of star formation in brightest cluster galaxies (BGCs). X-ray observations have long suggested that intracluster gas should be condensing and forming stars at the centers of galaxy clusters. However, observed levels of star formation in these systems are only 1%-10% of the cooling rate expected from early X-ray imaging. Now Chandra observations are showing clear signs of AGN feedback in the form of cavities in the X-ray gas, indicating that AGNs somehow act to limit star formation in BCGs. Yet, in many BGCs star formation still continues at a reduced level, and there are now abundant observations in the Spitzer archive that can help us study it. We are therefore proposing a Spitzer archival program to compare the IR signatures of star formation in BCGs with X-ray observations of those same systems that provide information about the history of AGN feedback, in order to clarify the relationship between star formation and feedback in the universe's largest galaxies.
Cavagnolo Kenneth
Donahue Megan
O'Connell Robert
Voit Gerard Mark
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