Gamma Rays, X-Rays, and Optical Light from the Cobalt and the Neutron Star in SN 1987A

We present recent developments in modeling the X-ray and γ-ray emission from SN 1987A by taking into account both the decaying cobalt and the buried neutron star. The light curve and the spectra evolution of X-rays and γ-rays are well modeled up to day ~ 300 if mixing of ^56^Co into hydrogen-rich envelope is assumed. However, the 16-28 keV flux observed by Ginga declines very slowly, whereas the spherical mixing model predicts that the flux should have decreased by a large factor at t > 300^d^. We demonstrate that this problem can be solved if the photoelectric absorption of X-rays is effectively reduced as a result of the formation of chemically inhomogeneous clumps. We also investigate whether ^57^Co and a buried neutron star can make an additional contribution to the flattening of the X-ray light curve for t > 500^d^. Based on the adopted hydrodynamical model and the abundance distribution, we offer predictions for future optical, X-ray, and γ-ray light curves by taking into account other radioactive sources (^57^Co and ^44^Ti) and various types of the central source, e.g., a buried neutron star accreting the reinfalling material or an isolated pulsar.