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For refcode 1998PASJ...50..187F:
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Copyright by Astronomical Society of Japan. 1998PASJ...50..187F ASCA Measurements of Silicon and Iron Abundances in the Intracluster Medium Yasushi FUKAZAWA, Kazuo MAKISHIMA, Takayuki TAMURA, Hajime EZAWA, Haiguang XU, Yasushi IKEBE, Ken'ichi KIKUCHI, and Takaya OHASHI Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 E-mail(YF) fukazawa@amalthea.phys.s.u-tokyo.ac.jp Institute for Space Astrophysics, Department of Physics, Shanghai Jiao Tong University, Huashan Road 1954, Shanghai 200030, PRC Max-Planck-Institut fur extraterrestrische Physik, Giessenbachstrasse, D- 85748 Garching, Germany Department of Physics, Faculty of Science, Tokyo Metroplitan University, Minami-Ohsawa, Hachioji, Tokyo, 192-0397 (Received 1997 August 6; accepted 1998 January 29) Abstract We analyzed the ASCA X-ray data of 40 nearby clusters of galaxies, whose intracluster-medium temperature distributes in the range of 0.9-10 keV. We measured the Si and Fe abundances of the intracluster medium, spatially averaging over each cluster, but excluding the central ~0.15h_50_^-1^ Mpc region in order to avoid any possible abundance gradients and complex temperature structures. The Fe abundances of these clusters are 0.2-0.3 solar, with only weak dependence on the temperature of the intracluster medium, hence on the cluster richness. In contrast, the Si abundance is observed to increase from 0.3 to 0.6-0.7 solar from the poorer to richer clusters. These results suggest that the supernovae of both type-Ia and type-II significantly contribute to the metal enrichment of the intracluster medium, with the relative contribution of type-II supernovae increasing towards richer clusters. We suggest a possibility that a considerable fraction of type-II supernova products escaped from poorer systems. Key words: Galaxies: abundances - Galaxies: clustering - Galaxies: intergalactic medium - X-rays: galaxies
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