Impacts of the detection of Cassiopeia A point source

Very recently the Chandra first light observation discovered a point-like s ource in the Cassiopeia A supernova remnant. This detection was subsequentl y confirmed by the analyses of the archival data from both ROSAT and Einste in observations. Here we compare the results from these observations with t he scenarios involving both black holes (BHs) and neutron stars (NSs). If t his point source is a BH, we offer as a promising model a disk-corona type model with a low accretion rate in which a soft photon source at similar to 0.1 keV is Comptonized by higher energy electrons in the corona. If it is an NS, the dominant radiation observed by Chandra most likely originates fr om smaller, hotter regions of the stellar surface, but we argue that it is still worthwhile to compare the cooler component from the rest of the surfa ce with cooling theories. We emphasize that the detection of this point sou rce itself should potentially provide enormous impacts on the theories of s upernova explosion, progenitor scenario, compact remnant formation, accreti on to compact objects, and NS thermal evolution.