Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-12
Astrophys.J. 587 (2003) L71-L74
Astronomy and Astrophysics
Astrophysics
17 pages, 1 figure, accepted for publication in ApJL
Scientific paper
10.1086/375262
An analysis of type Ia supernova (SNIa) events in early type galaxies from Evans et al (1989) database provides strong evidence that the rate of type Ia supernovae (SNe) in radio-loud galaxies is about 6 times higher than the rate measured in radio-quiet galaxies, i.e. SNIa-rate$(radio-loud galaxies)=0.47^{+0.23}_{-0.15} h^2_{50}$ SNe per century and per 10$^{10}$L$^{B}_\odot$ (SNU) as compared to SNIa-rate$(radio-quiet galaxies)\lsim 0.080 h^2_{50}$ SNU. The exact value of the enhancement is still rather uncertain, but is likely to be in the range $\sim 4-15$. We discuss the possible causes of this result and we conclude that that the enhancement of SNIa explosion rate in radio-loud galaxies has the same common origin as their being strong radio sources, but that 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 are responsible for inducing both strong radio activity in $\sim$14% of early type galaxies, and the $\sim1$ Gyr old stellar population needed to supply an adequate number SNIa progenitors. Within this scenario we predict that the probability of detecting a core-collapse SN event in radio-loud elliptical galaxies amounts to about 4% of their SNIa events.
Della Valle Massimo
Panagia Nino
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