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Date and Time of the Query: 2019-08-20 T23:15:09 PDT
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For refcode 1993ApJ...413L.109F:
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Copyright by American Astronomical Society. Reproduced by permission
1993ApJ...413L.109F THE OPTICAL RECOVERY OF SN 1970G IN M101 (NGC 5457) ROBERT A. FESEN Department of Physics and Astronomy, 6127 Wilder Laboratory, Dartmouth College, Hanover, NH 03755 Received 1993 April 9; accepted 1993 May 26 ABSTRACT Optical emission from SN 1970G nearly 22 yr after maximum light is presented and discussed. Images show SN 1970G to have occurred 3.8" +/- 0.2" N and 1.9" +/- 0.2" W off the optical peak of M101's bright H II region NGC 5455. A low-dispersion spectrum shows broad 5400 to 6500 km s^-1^ emissions of H{alpha} and [O I] {lambda}{lambda}6300, 6364 with luminosities comparable to those seen in SN 1980K. We compare the SN 1970G spectrum to those of other optically detected, radio-bright evolved SNe and suggest SN-circumstellar matter interaction as the dominant late-time energy source for the observed optical emission. The detection of this 20 + yr old, rather ordinary Type II-L SN raises the possibility of detecting even older Type II SNe, especially if located in relatively uncrowded regions of the parent galaxy. Subject headings: galaxies: individual (NGC 5457) - ISM: supernova remnants - supernovae: individual (SN 1970G)
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