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X-Rays from the Explosion Site: Fifteen Years of Light Curves of SN 1993JWe present a comprehensive analysis of the X-ray light curves of SN 1993J in a nearby galaxy M81. This is the only supernova other than SN 1987A, which is so extensively followed in the X-ray bands. Here we report on SN 1993J observations with the Chandra in the year 2005 and 2008, and Swift observations in 2005, 2006 and 2008. We combined these observations with all available archival data of SN 1993J, which includes ROSAT, ASCA, Chandra, and XMM-Newton, observations from 1993 April to 2006 August. In this paper we report the X-ray light curves of SN 1993J, extending up to fifteen years, in the soft (0.3-2.4 keV), hard (2-8 keV) and combined (0.3-8 keV) bands. The hard and soft-band fluxes decline at different rates initially, but after about 5 years they both undergo a t(sup -1) decline. The soft X-rays, which are initially low, start dominating after a few hundred days. We interpret that most of the emission below 8 keV is coming from the reverse shock which is radiative initially for around first 1000-2000 days and then turn into adiabatic shock. Our hydrodynamic simulation also confirms the reverse shock origin of the observed light curves. We also compare the Ha line luminosity of SN 1993J with its X-ray light curve and note that the Ha line luminosity has a fairly high fraction of the X-ray emission, indicating presence of clumps in the emitting plasma.
Document ID
20090023870
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Chandra, Poonam
(National Radio Astronomy Observatory Charlottesville, VA, United States)
Dwarkadas, Vikram V.
(Chicago Univ. Chicago, IL, United States)
Ray, Alak
(Tata Inst. of Fundamental Research Mumbai, India)
Immler, Stefan
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Pooley, David
(Wisconsin Univ. Madison, WI, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Other

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