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Gamma rays, X-rays, and optical light from the cobalt and the neutron star in SN 1987A
Kumagai, Shiomi; Shigeyama, Toshikazu; Nomoto, Ken'ichi; Itoh, Masayuki; Nishimura, Jun; Tsuruta, Sachiko
AA(Tokyo, University, Japan), AB(Tokyo, University, Japan), AC(Tokyo, University, Japan), AD(NASA, Goddard Space Flight Center, Greenbelt, MD), AE(Institute of Space and Astronautical Science, Sagamihara, Japan)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 412-422. Research supported by the Institute of Space and Astronautical Sciences and Japan Society for the Promotion of Science. (ApJ Homepage)
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NASA/STI Keywords:
Cobalt Isotopes, Gamma Ray Astronomy, Light (Visible Radiation), Neutron Stars, Supernova 1987a, X Ray Astronomy, Abundance, Light Curve, Nuclear Fusion, Pulsars, Radioactive Decay
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Recent developments in modeling the X-ray and gamma-ray emission from SN 1987A are discussed by taking into account both the decaying cobalt and the buried neutron star. The light curve and the spectra evolution of X-rays and gamma-rays are well modeled up to day of about 300 if mixing of Co-56 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 greater than 300d. It is shown 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. Based on the adopted hydrodynamical model and the abundance distribution, predictions are offered for future optical, X-ray, and gamma-ray light curves by taking into account other radioactive sources and various types of the central source, e.g., a buried neutron star accreting the reinfalling material or an isolated pulsar.

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