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Date and Time of the Query: 2019-06-24 T14:35:02 PDT
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For refcode 1990A&A...234...84G:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1990A&A...234...84G Multiple supernova events in spiral galaxies B. N. G. Guthrie Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, Scotland Received September 28, 1989; accepted January 12, 1990 Abstract. A diameter-limited sample of 845 Sb-Sd galaxies is compiled. Over the last century 166 SN events have been recorded in these galaxies, and two or more SNe have been found in 23 of the galaxies. The apparent frequency distribution of SNe for the 845 galaxies is non-Poissonian; this is due not only to a dependence of the SN production rate on global properties of the galaxies (Hubble type and luminosity) but also to the non-uniformity of SN searches and a strong discrimination against the discovery of multiple SN events in high inclination Sc-Sd galaxies. The discrimination with regard to inclination is not primarily due to preferential observing of face-on galaxies. There is also a marked decline in the SN discovery rate with increasing distance. Thus any distinction between "fast producers" and normal galaxies with the same global properties is not as great as that envisaged by Richter and Rosa (1988). The formation of SN progenitors is discussed briefly. Key words: supernovae - spiral galaxies - star formation
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