The X-ray spectrum and light curve of Supernova 1995N

D. W. Fox, W. H.G. Lewin, A. Fabian, K. Iwasawa, R. Terlevich, H. U. Zimmermann, B. Aschenbach, K. Weiler, S. Van Dyk, R. Chevalier, R. Rutledge, H. Inoue, S. Uno

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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 1998 January ASCA X-ray spectrum is well fitted by a thermal bremsstrahlung (kT ∼ 10 keV, NH ∼ 6 × 1020 cm-2) or power-law (α ∼ 1.7, WH ∼ 1021 cm-2) model. The X-ray light curve shows evidence for significant flux evolution between 1996 August and 1998 January: the count rate from the source decreased by 30 per cent between our 1996 August and 1997 August ROSAT observations, and the X-ray luminosity most likely increased by a factor of ∼2 between our 1997 August ROSAT and 1998 January ASCA observations, although evolution of the spectral shape over this interval is not ruled out. The high X-ray luminosity, LX ∼ 1041 erg s-1, places SN 1995N in a small group of Type Un supernovae with strong circumstellar interaction, and the evolving X-ray luminosity suggests that the circumstellar medium is distributed inhomogeneously.

Original languageEnglish (US)
Pages (from-to)1154-1158
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Dec 21 2000

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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