Suzaku and XMM-Newton Observations of the Metallicity Distribution in the Intracluster Medium of the Fornax cluster

摘要

The metallicity distribution in the intracluster medium (ICM) of the Fornax cluster was studied with Suzaku and XMM-Newton. The abundances of O, Mg, Si, S, and Fe within a radius of 0.2γ180 were measured with high accuracy with Suzaku. The abundance of Fe and the gas mass within a radius of 0.3γ180 were measured with XMM-Newton. The oxygen and iron mass-to-light ratio (OMLR, IMLR) within 0.1γ180 are over an order of magnitude lower than those of rich clusters and some relaxed groups of galaxies like the NGC 5044 group. The metal mass to light ratios outside 0.1γ180 increases with radius, and may become comparable to those of the NGC 5044 group at 0.4-0.5γ180. In the Fornax cluster, the asymmetric X-ray emission may point to large-scale dynamical evolution, which might have hampered the strong concentration of hot gas in the center.