Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50251e&link_type=abstract
Spitzer Proposal ID #50251
Computer Science
Scientific paper
Infrared properties of brightest cluster galaxies (BCGs) are of great interest since they may be related to the intracluster gas cooling process in cluster cores (e.g., cooling flows). Spitzer's great sensitivity has made it possible for the first time to study the infrared properties of a large number of cluster BCGs systematically. Some interesting results have already emerged from our surveys: (1) infrared-luminous BCGs are only found in the cluster cores with extremely short gas cooling times (<1 Gyr); (2) the source of infrared luminosity can be star formation or AGN depending on the BCG; (3) a few of the infrared-luminous BCGs show exceptionally strong molecular hydrogen emission lines, which are a factor of 50 overluminous compared with those of typical LIRGs/ULIRGs in one case. Here, we propose to conduct a more extensive and definitive IRS spectroscopic follow-up of 22 infrared-luminous BCGs selected from our large Cycle 3 and 4 BCG surveys. This proposed observation will allow us to define the common characteristics of this class of galaxies, which may have some important implications for the process of galaxy formation in general (i.e., cooling gas flows accreting onto a seed mass).
Baum Stefi
Edge Alastair
Egami Eiichi E.
O'Dea Christopher
Quillen Alice
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