Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420..152y&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 420, no. 1, p. 152-158
Astronomy and Astrophysics
Astronomy
16
Galactic Clusters, Irregular Galaxies, Light Curve, Markarian Galaxies, Star Formation Rate, Supernovae, Emission Spectra, Luminosity, Radio Astronomy, Radio Emission, Very Large Array (Vla), X Ray Spectra
Scientific paper
I present radio observations of the clumpy irregular galaxy Mrk 297 (= NGC 6052) made with the Very Large Array (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 is 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 non-thermal radio emission to supernova rate. The resulting supernova rate estimated for the entire galaxy Mrk 297 is high (0.3/yr). However, most individual Type II radio supernovae are too weak to be detected at the distance of Mrk 297.
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