Temperature map of the Perseus Cluster of galaxies observed with ASCA

We present a two-dimensional temperature map of the Perseus Cluster based o n multipointing observations with the ASCA Gas Imaging Spectrometer, coveri ng a region with a diameter of similar to2 degrees. By correcting for the e ffect of the X-ray telescope response, the temperatures were estimated from hardness ratios, and the complete temperature structure of the cluster wit h a spatial resolution of about 100 kpc was obtained for the first time. Th ere is an extended cool region with a diameter of similar to 20' and kT sim ilar to5 about 20' east of the cluster center. This region also shows highe r surface brightness and is surrounded by a large ringlike hot region with kT greater than or similar to 7 keV and is likely to be a remnant of a merg er with a poor cluster. Another extended cool region is extending outward f rom the IC 310 subcluster. These features and the presence of several other hot and cool blobs suggest that this rich cluster has been formed as the r esult of a repetition of many subcluster mergers.