Effects of Cooling Gas, Star Formation, Active Nuclei, and Mergers in Clusters of Galaxies

Details Effects of Cooling Gas, Star Formation, Active Nuclei, and Mergers in Clusters of Galaxies Effects of Cooling Gas, Star Formation, Active Nuclei, and Mergers in Clusters of Galaxies

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3228f&link_type=abstract

Spitzer Proposal ID #3228

Physics

Scientific paper

Spitzer IRAC imaging observations of the two brightest extragalactic X-ray sources, the clusters Virgo/M87 and Perseus/NGC1275 provide an opportunity to sensitively inventory the mass content in cluster cores and to determine the distribution of cool material. While the mass cooling from the hot gas phase has been shown to be smaller than the simple ``cooling flow'' model, significant amounts of gas are cooling. Many clusters show extended emission line regions, excess blue light from young stars, and dust. Combining images of the X-ray emitting gas, HST and ground-based imaging of the emission line gas, and sensitive radio observations with the high angular resolution of Spitzer IRAC observations will address the perplexing properties found in the central galaxies of rich clusters. Resolved images of cool material around the central galaxies M87/Virgo and NGC1275/Perseus promise new insights in understanding 1) the relationship between galaxy mergers, the matter that they inject into the central regions of clusters, and the onset of activity in the central galaxy, 2) the mass deposition rate in ``cooling flows'' 3) the origin of the dust associated with the emission line structures and 4) the effects of relativistic plasma, ejected by the central black hole, on the cooling gas and on star formation from this gas.

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