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For refcode 1993A&A...268..472C:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1993A&A...268..472C The rate of supernovae I. The data base, the recipe and the uncertainties E. Cappellaro, M. Turatto, S. Benetti, D.Yu. Tsvetkov, O. S. Bartunov, and I.N. Makarova Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy Dipartimento di Astronomia, Universita of Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy Sternberg Astronomical Institute, Universitetskij Prospect V-234, 119899 Moscow W-234, Russia Received December 11, 1991; accepted September 19, 1992 Abstract. With the aim to reduce the errors due to small number statistics in the determination of the rate of supernovae, we joined the efforts of two independent SN searches carried out, during the last three decades, at the Asiago Astrophysical Observatory (Italy) and at the Crimean Station of the Sternberg Institute of Moscow (Russia). The merged data base was analyzed by means of a special software, which allowed to derive the SN rate for each of the 4 types of SNe considered: Ia, Ib/c, IIP, IIL. We estimated also an upper limit for the rate of SNe similar to 1987A. As a first step we investigate quantitatively the dependence of the SN rate on several input parameters. In particular it is shown that the errors in the absolute magnitude of SNe at maximum and in the limiting discovery magnitudes of the telescopes bring the major uncertainties whereas, in our case, the errors in the dispersion of the maximum absolute magnitude of SNe are not so crucial. Moreover we stress that, thanks to the oversampling of the merged data base, the influence of the input assumptions is strongly reduced compared with statistics based on a single search. We derive the SN rate for the average galaxy and explore the dependence on the adopted galaxy catalogue, demonstrating that part of the differences found among the previously published SN rates is due to the adoption of a different input catalogue, in particular when one compares the SN rates in galaxies of different morphological types. The dependence of the SN rate on the physical parameters of the host galaxies will be investigated in a forthcoming paper. Key words: supernovae and supernova remnants: general - surveys - galaxies: general - galaxies: stellar contents of
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