Proposal Abstract

We propose to obtain HETGS data on two bright clusters of galaxies which show strong evidence for cooling flows. PKS 0745-191 (z=0.1028) and Abell 1835 (z=0.2523) exhibit large cooling rates of ~1400 M_sol/yr and ~2300 M_sol/yr, respectively. The HETG will allow us to measure a number of X-ray emission lines from the cooling gas. Each of these measurements will provide an independent test of the cooling rates. In addition, it will be possible to search for absorption features due to accumulated cold material. Determining the fate of the large amounts of cooling material predicted in these objects is currently the greatest challenge facing the cooling flow theory.

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