Computer Science
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70059m&link_type=abstract
Spitzer Proposal ID #70059
Computer Science
Scientific paper
Numerous studies of the cores of galaxy clusters have revealed that the gas in central regions is not cooling at the rates predicted by the traditional cooling flow model. This discrepancy has inspired a search for heating models that can explain current observations. AGN feedback is considered an attractive solution to several connected problems, such as the high-mass end truncation of galaxy distribution and the absence of cooling-flows in centers of galaxy clusters. Amidst the emerging hypothesis of self-regulated AGN feedback, infrared, optical and FUV observations of clusters also indicate the presence of large amounts of cold gas in their brightest cluster galaxies (BCGs). In this proposal we aim to investigate a sample of 11 BCGs covering a representative range of BCG and cluster properties and having an extensive wavelength coverage. This sample is the basis of a Herschel Key Project and has been awarded 130 hrs with Herschel to study the detailed properties of the cold gas and dust in these systems. We propose to obtain Spitzer IRAC 3.6 micron and 4.5 micron observations of the only two BCGs in our sample that have MIPS but no IRAC data. All of the remaining 9 BCGs have been observed with both IRAC as well as MIPS. These observations will help us to accurately constrain the spectral energy distribution of the dust in these BCGs, to estimate the star formation rates for comparison with the X-ray derived gas mass-deposition rates, and to examine the AGN contribution to the IR emission. We can then better understand the complex inter-relationship between the cooling of the intracluster-medium, cold gas and dust, star formation and AGN activity.
Baum Stefi
Combes Francoise
Donahue Megan
Edge Alastair
Egami Eiichi E.
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