Computer Science
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop..488d&link_type=abstract
Spitzer Proposal ID #488
Computer Science
Scientific paper
Many cluster cores have been observed by Spitzer. However, most of these cores host Brightest Cluster Galaxies (BCGs) with unusual properties, such as large H-alpha luminosities, significant radio sources, or on-going interactions and mergers. We have identified a control sample of six BCGs lacking any of these signatures, in clusters of similarly high mass and X-ray luminosity. Our previous X-ray studies of clusters of galaxies have found that the central gas entropy, an observable quantity from the X-ray data corresponding to kT/n_elec^(2/3), is a direct indicator of gas with short cooling times.The presence of low-entropy X-ray gas in the cores of clusters of galaxies is strongly correlated with the presence of BCGs with star formation or radio sources. Toward the aim of establishing a scientifically solid control sample of BCGs, we are proposing observations of these six BCGs, in clusters whose central gas entropy ranges from low (~10 keV cm^2) to quite high(~300 keV cm^2), at z=0.03-0.09 and L_x>1E44 erg/s. This control sample will allow us to make specific tests of the effects of central entropy and direct comparisons between BCGs which harbor active AGN and star formation and those that do not.
Cavagnolo Kenneth
Donahue Megan
O'Dea Christopher
Voit Gerard Mark
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