Candidates for abundance gradients at intermediate red-shift clusters.
In this work I present evidence for the possible existence of central abundance enhancements in two clusters of galaxies at intermediate red-shifts: Abell 1413 (z approximately 0.14) and Abell 2390 (z approximately 0.23). The results are based on ASCA (Advanced Satellite for Cosmolgy and Astrophysics) data reduction of x-ray spatially resolved spectra. The Fe abundance for A1413 drops from 0.37 +/- 0.08 (in the central 2 arcmin) to 0.20 +/- 0.06 (in the outer 2-6 arcmin), while in A2390 the very central abundance is 0.77 +/- 0.45 (central arcmin) and drops to 0.12 +/- 0.12 in the outer regions.
Dupke
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Department of Physics and Astronomy, University of Alabama, Tuscaloosa 35487-0324, USA.