The Influence of the Environment on the Rate of Type Ia Supernovae in Radio Galaxies

Details The Influence of the Environment on the Rate of Type Ia Supernovae in Radio Galaxies The Influence of the Environment on the Rate of Type Ia Supernovae in Radio Galaxies

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..342..133d&link_type=abstract

1604-2004: Supernovae as Cosmological Lighthouses, ASP Conference Series, Vol. 342, Proceedings of the conference held 15-19 Jun

Mathematics

Logic

Scientific paper

An analysis of Type Ia Supernova (SNIa) events in early type galaxies from the tet{capp99} database provides conclusive evidence that the rate of type Ia Supernovae (SNe) in radio-loud galaxies is about 4 times higher than the rate measured in radio-quiet galaxies, i.e. SNIa-rate(radio-loud galaxies)=0.43^{+0.19}_{-0.14}h^2_{75} SNu as compared to SNIa-rate(radio-quiet galaxies)=0.11^{+0.06}_{-0.03}h^2_{75} SNu. The actual value of the enhancement is likely to be in the range ˜ 2-7 (P˜ 10^{-4}). We analyse the possible causes of this result and conclude that the enhancement of SNIa explosion rate in radio-loud galaxies has the same origin as their being strong radio sources, but there is no causality link between the two phenomena. We argue that repeated episodes of interaction and/or mergers of early type galaxies with dwarf companions, on times-scale of about 1 Gyr, are responsible for inducing both strong radio activity observed in ˜14% of early type galaxies and to supply an adequate number of SNIa progenitors to the stellar population of ellipticals.

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