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Date and Time of the Query: 2019-08-18 T02:45:46 PDT
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For refcode 2005ApJ...632L..99I:
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2005ApJ...632L..99I Discovery of X-Ray Emission from Supernova 1970G with Chandra: Filling the Void between Supernovae and Supernova Remnants Stefan Immler and K. D. Kuntz Abstract. We report the discovery of X-ray emission from SN 1970G in M101, 35 yr after its outburst, using deep X-ray imaging with the Chandra X-Ray Observatory. The Chandra ACIS spectrum shows that the emission is soft (<~2 keV) and characteristic of the reverse-shock region. The X-ray luminosity, L_0.3 -- 2_=(1.1+/-0.2)x10^37^ ergs s^-1^, is likely caused by the interaction of the supernova shock with dense circumstellar matter. If the material was deposited by the stellar wind from the progenitor, a mass-loss rate of M^dot^=(2.6+/-0.4)x10^-5^ M_sun_ yr^-1^(v_w_/10 km s^-1^) is inferred. Utilizing the high-resolution Chandra ACIS data of SN 1970G and its environment, we reconstruct the X-ray lightcurve from previous ROSAT HRI, PSPC, and XMM-Newton EPIC observations, and find a best-fit linear rate of decline of L is proportional to t^-s^ with index s=2.7+/-0.9 over a period of ~20 -- 35 yr after the outburst. As the oldest supernova detected in X-rays, SN 1970G allows, for the first time, direct observation of the transition from a supernova to its supernova remnant phase. Key words: Stars: Circumstellar Matter, ISM: Supernova Remnants, Stars: Supernovae: Individual: SN 1970G, X-Rays: General, X-rays: individual (SN 1970G), X-rays: individual (M101)
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