ASCA Observations of the Temperature Structure and Metal Distribution in the Perseus Cluster of Galaxies

Large-scale distributions of hot-gas temperature and Fe abundance in thePerseus cluster have been studied with multi-pointing observations by the GISinstrument on ASCA. Within a radius of 20' from the cluster center, the energyspectra requires two temperature components, in which the cool componentindicates kT ~ 2 keV and the hot-component temperature shows a significantdecline from about 8 keV to 6 keV toward the center. In the outer region of thecluster, the temperature shows a fluctuation with an amplitude of about 2 keVand suggest that a western region at ~16' from the cluster center is relativelyhotter. As for the Fe abundance, a significant decline with radius is detectedfrom 0.44 solar at the center to ~0.1 solar at a 50' offset region. If observedFe-K line intensity within 4' from the center is suppressed by a factor of 2due to the resonance scattering effect, the corrected Fe mass density followsthe galaxy distribution. Finally, our results do not support the large-scalevelocity gradients previously reported from the same GIS data.Comment: 13 pages, 8 figures, Latex(pasj95.sty),accepted in PAS