On Core Collapse Supernovae in Normal and in Seyfert Galaxies

Details On Core Collapse Supernovae in Normal and in Seyfert Galaxies On Core Collapse Supernovae in Normal and in Seyfert Galaxies

2002-01-07

arxiv.org/abs/astro-ph/0201085v1

Mon.Not.Roy.Astron.Soc. 331 (2002) L25

Astronomy and Astrophysics

Astrophysics

Accepted for Publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05287.x

This paper estimates the relative frequency of different types of core-collapse supernovae, in terms of the ratio f between the number of type Ib--Ic and of type II supernovae. We estimate f independently for all normal and Seyfert galaxies whose radial velocity is <=14000 km/s, and which had at least one supernova event recorded in the Asiago catalogue from January 1986 to August 2000. We find that the ratio f is approx. 0.23+/-0.05 in normal galaxies. This value is consistent with constant star formation rate and with a Salpeter Initial Mass Function and average binary rate approx. 50 %. On the contrary, Seyfert galaxies exceed the ratio f in normal galaxies by a factor approx. 4 at a confidence level >= 2 sigma. A caveat is that the numbers for Seyferts are still small (6 type Ib-Ic and 6 type II supernovae discovered as yet). Assumed real, this excess of type Ib and Ic with respect to type II supernovae, may indicate a burst of star formation of young age (<= 20 Myr), a high incidence of binary systems in the inner regions (r <= 0.4 R25) of Seyfert galaxies, or a top-loaded mass function.

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