Abstract
view Abstract Citations (43) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A search for radio emission from six historical supernovae in the galaxies NGC 5236 and NGC 5253. Cowan, J. J. ; Branch, D. Abstract A VLA search for the 20 cm radio emission of six historical supernovae in NGC 5253 and 5236 has detected none of them. At an assumed distance of 4 Mpc, the 3-sigma upper limits of about 0.9 mJy require a 20 cm monochromatic absolute luminosity for these 9-86 years old supernovae which is less than that of Cas A. Extrapolation of the 21 cm log N-log S relation indicates that two point sources detected in the NGC 5236 field are probably not background sources, and although both sources lie along the inner edge of the northern spiral arm, neither coincides with H II regions in NGC 5236. It is suggested that these point sources may be supernova remnants emitting at 20 cm at approximately the Cas A level. Publication: The Astrophysical Journal Pub Date: July 1982 DOI: 10.1086/160046 Bibcode: 1982ApJ...258...31C Keywords: Radio Astronomy; Radio Sources (Astronomy); Supernova Remnants; Galaxies; H Ii Regions; Luminosity; Astronomy full text sources ADS | data products SIMBAD (12) NED (12)
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