The X-Ray Light Curve of the Very Luminous Supernova SN 1978K in NGC 1313

Details The X-Ray Light Curve of the Very Luminous Supernova SN 1978K in NGC 1313 The X-Ray Light Curve of the Very Luminous Supernova SN 1978K in NGC 1313

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...456..187s&link_type=abstract

Astrophysical Journal v.456, p.187

Astronomy and Astrophysics

Astronomy

28

Galaxies: Individual Ngc Number: Ngc 1313, Stars: Pulsars: General, Stars: Supernovae: Individual Alphanumeric: Sn 1978K, Ism: Supernova Remnants, X-Rays: Stars

Scientific paper

We present the 0.5-2.0 keV light curve of the X-ray luminous supernova SN 1978K in NGC 1313, based on six ROSAT observations spanning 1990 July to t994 July. SN 1978K is one of a few supernovae or supernova remnants that are very luminous (˜1039-1040 ergs s-1) in the X-ray, optical, and radio bands, and the first, at a supernova age of 10-20 yr, for which sufficient data exist to create an X-ray light curve. The X-ray flux is approximately constant over the 4 yr sampled by our observations, which were obtained 12-16 yr after the initial explosion. Three models exist to explain the large X-ray luminosity: pulsar input, a reverse shock running back into the expanding debris of the supernova, and the outgoing shock crushing of cloudlets in the debris field. Based upon calculations of Chevalier & Fransson, a pulsar cannot provide sufficient energy to produce the soft X-ray luminosity. Based upon the models and the light curve to date, it is not possible to discern the evolutionary phase of the supernova.

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