$Ginga$ LAC and $Einstein$ SSS X-ray Spectral Evidence of Abundance Gradients in Galaxy Clusters

Session 53 -- Cluster Cooling Flows and Abundances
Display presentation, Thursday, January 13, 9:30-6:45, Salons I/II Room (Crystal Gateway)

[53.01] $Ginga$ LAC and $Einstein$ SSS X-ray Spectral Evidence of Abundance Gradients in Galaxy Clusters

R. E. White III (U. Alabama), C. S. R. Day (NASA/GSFC/USRA), I. Hatsukade (Miyazaki U.), J. P. Hughes (CfA)

We jointly analyzed the $Ginga$ LAC and $Einstein$ SSS spectra of four cooling flow clusters: A496, A1795, A2142 \& A2199. We took advantage of the two instruments' different fields of view (6 arcmin diameter for the SSS, 1$\times$2 degrees for the LAC) to determine whether there were spatial gradients in temperature, abundances and X-ray absorbing column densities. Each cluster has firm evidence of a relatively cool central component. The inclusion of such cool components in the joint spectral analysis leads to somewhat higher global temperature determinations than are derived from the higher energy LAC data alone. The abundances appear to be centrally enhanced in at least two (A496, A2142) and possibly three (A2199) of the four clusters. In these cases, the central cool component typically has abundances which exceed solar values. We also confirm the presence of large amounts of cold absorbing matter in three of the four clusters (A496, A1795 \& A2199) and show that it is likely to be intrinsic to the cluster cooling flows.

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