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Date and Time of the Query: 2019-08-17 T06:18:57 PDT
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For refcode 2001AJ....122..966R:
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Copyright by American Astronomical Society. Reproduced by permission
2001AJ....122..966R CHANDRA AND ASCA X-RAY OBSERVATIONS OF THE TYPE II-L SUPERNOVA SN 1979C IN NGC 4321 A. RAY Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India R. PETRE Laboratory for High Energy Astrophysics, NASA Goddard Space Flight Center, Code 660.1, Greenbelt, MD 20771 AND E. M. SCHLEGEL Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 Received 2001 March 12; accepted 2001 March 27 ABSTRACT We report on the X-ray observation of the radio-selected supernova SN 1979C carried out with ASCA in 1997 December and serendipitously available from a Chandra Guaranteed Time Observation in 1999 November. The supernova, of type SN II-linear (SN II-L), was first observed in the optical and occurred in the weakly barred, almost face-on spiral galaxy NGC 4321 (M100). The galaxy, a member of the Virgo S Cluster, is at a distance of 17.1 Mpc and contains at least three other supernovae discovered in this century. The useful exposure time was ~25 ks for the Solid-State Imaging Spectrometer (SIS), ~28 ks for the Gas Scintillation Imaging Spectrometer, and ~2.5 ks for the Chandra Advanced CCD Imaging Spectrometer. No point source was detected at the radio position of SN 1979C in a 3' diameter, half-power response circle in the ASCA data. The background- and galaxy-subtracted supernova (SN) signal had a 3 {sigma} upper limit to the flux of 6.3 x 10^-14^ ergs cm^-2^ s^-1^ in the full ASCA SIS band (0.4-10.0 keV) and a 3 {sigma} upper limit of less than (3-4) x 10^-14^ erg cm^-2^ s^-1^ in the 2-10 keV band. In the Chandra data, a source at the position of SN 1979C is marginally detected at energies below 2 keV at a flux consistent with the ROSAT HRI detection in 1995. At energies above 2 keV, no source is detected with an upper limit of 3 x 10^-14^ ergs cm^-2^ s^-1^. These measurements give the first ever X-ray flux limit of a Type II-L SN above 2 keV, which is an important diagnostic of the outgoing shock wave plowing through the circumstellar medium. Key words: galaxies: individual (NGC 4321) - supernovae: general - supernovae: individual (SN 1979C)
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