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For refcode 1994AJ....108.1893S:
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1994AJ....108.1893S X-RAY EMISSION FROM THE HISTORICAL SUPERNOVAE IN THE SPIRAL GALAXY NGC 6946: SN 1980K AND SN 1968D RECOVERED? ERIC M. SCHLEGEL Code 668, NASA-Goddard Space Flight Center, Greenbelt, Maryland 20771 Electronic mail: eric@heasfs.gsfc.nasa.gov (I) Received 1994 May 18; revised 1994 July 13 ABSTRACT This paper describes a study of the ROSAT PSPC observation of the spiral galaxy NGC 6946 to search for x-ray emission from the six historical supernovae that have occurred in that galaxy. At the age of these supernovae, all could be emitting x rays due to circumstellar interactions. SN 1980K may be present based upon the hardness ratio and the coincidence of an x-ray source with the optical position. Its luminosity agrees with a recent prediction by Chevalier & Fransson. The situation for SN 1968D, apparently recovered in VLA data, is less clear due to source confusion, but suggests SN 1968D has not been recovered. Only upper limits are available for the remaining four supernovae that have occurred in this galaxy.
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