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Date and Time of the Query: 2019-08-24 T02:53:51 PDT
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For refcode 1994ApJ...420..152Y:
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Copyright by American Astronomical Society. Reproduced by permission
1994ApJ...420..152Y THE CLUMPY GALAXY MARKARIAN 297 AND ITS SUPERNOVA ACTIVITY Q. F. YIN National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475 Received 1993 March 17; accepted 1993 July 13 ABSTRACT I present radio observations of the clumpy irregular galaxy Mrk 297 (= NGC 6052) made with the VLA at 20, 6, 3.6, and 2 cm from 1980 January to 1992 April, which show that the variable, compact source (Mrk 297A) is a single supernova with the highest peak radio luminosity known for a supernova. Twenty-one VLA flux-density measurements at four wavelengths of the compact source, obtained over the past 12 yr, yield a satisfactory fit to Chevalier's model for supernova light curves. Shorter period fluctuations in the observations are significant and are consistent with refractive interstellar scintillation. The supernova rate for the entire galaxy can be estimated from a global formula (Condon & Yin 1990) which uniquely relates total nonthermal radio emission to supernova rate. The resulting supernova rate estimated for the entire galaxy Mrk 297 is high (0.3 yr^-1^).However, most individual Type II radio supernovae are too weak to be detected at the distance of Mrk 297. Subject headings: galaxies: individual (Markarian 297) - galaxies: stellar content - radio continuum: galaxies - supernovae: general
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