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| Paper: |
The Influence of the Environment on the Rate of Type Ia Supernovae in Radio Galaxies |
| Volume: |
342, 1604-2004: Supernovae as Cosmological Lighthouses |
| Page: |
133 |
| Authors: |
Della Valle, M.; Panagia, N.; Padovani, P.; Cappellaro, E.; Mannucci, F.; Turatto, M. |
| Abstract: |
An analysis of Type Ia Supernova (SNIa) events in early type galaxies from the Cappellaro, Evans & Turatto (1999) 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+0.19−0.14h275 SNu as compared to SNIa-rate( radio-quiet galaxies) = 0.11+0.06−0.03h275 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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