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M. W. Bautz (MIT Center for Space Research)
I present results from an ongoing program of Chandra imaging and spectroscopy of lensing clusters of galaxies. The X-ray data provide clear evidence that the program objects, including Abell 370, EMSS1358+6245 and EMSS1054-0321, exhibit a variety of dynamical states. Significant spatial variations in plasma temperature are observed within two of these clusters. I compare the quantity and spatial distribution of the dark matter in the cluster cores inferred from the lensing data with that obtained from the X-ray emitting gas. This comparison generally supports previously proposed explanations of the discrepancy between X-ray and lensing mass estimates.
This work was supported by NASA through contracts NAS-8-37716 and 1797-MIT-NA-A-38252.
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