The X-ray Spectrum and Light Curve of Supernova 1995N

Details The X-ray Spectrum and Light Curve of Supernova 1995N The X-ray Spectrum and Light Curve of Supernova 1995N

2000-08-25

arxiv.org/abs/astro-ph/0008410v1

Mon.Not.Roy.Astron.Soc.319:1154,2000

Astronomy and Astrophysics

Astrophysics

MNRAS accepted. 6 pages, 2 figures; uses mn.sty and psfig

Scientific paper

10.1046/j.1365-8711.2000.03941.x

We report on multi-epoch X-ray observations of the Type IIn (narrow emission line) supernova SN 1995N with the ROSAT and ASCA satellites. The January 1998 ASCA X-ray spectrum is well fitted by a thermal bremsstrahlung (kT~10 keV, N_H~6e20 cm^-2) or power-law (alpha~1.7, N_H~1e21 cm^-2) model. The X-ray light curve shows evidence for significant flux evolution between August 1996 and January 1998: the count rate from the source decreased by 30% between our August 1996 and August 1997 ROSAT observations, and the X-ray luminosity most likely increased by a factor of ~2 between our August 1997 ROSAT and January 1998 ASCA observations, although evolution of the spectral shape over this interval is not ruled out. The high X-ray luminosity, L_X~1e41 erg/sec, places SN 1995N in a small group of Type IIn supernovae with strong circumstellar interaction, and the evolving X-ray luminosity suggests that the circumstellar medium is distributed inhomogeneously.

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