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The Rate and the Origin of Type Ia SNe in Radio Galaxies

  • M. Della Valle
  • N. Panagia
  • E. Cappellaro
  • P. Padovani
  • M. Turatto
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 99)

Summary

An analysis of type Ia supernova (SNIa) events in early type galaxies from the Cappellaro et al. [6] database provides strong 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)=0.41−0.14/+0.13 h75/2 SNe per century and per 1010L⊙/B (SNU) as compared to SNIa-rate(radio-quiet)= 0.11 ± 0.03 h75/2 SNU. The exact value of the enhancement is still rather uncertain, but is likely to be in the range ≈2 − 7. We discuss the possible causes of this result and we conclude that the enhancement of the 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 ≈ 14% of early type galaxies, and the ≈ 1 Gyr old stellar population needed to supply an adequate number SNIa progenitors.

Keywords

Radio Galaxy Stellar Population Early Type Galaxy Radio Luminosity Active Star Formation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • M. Della Valle
    • 1
  • N. Panagia
    • 2
    • 3
  • E. Cappellaro
    • 4
  • P. Padovani
    • 2
    • 3
  • M. Turatto
    • 5
  1. 1.INAF-Arcetri Astrophysical ObservatoryFirenzeItaly
  2. 2.Space Telescope Science InstituteBaltimoreUSA
  3. 3.Affiliated with the Space Telescope Division of the European Space AgencyESTECNoordwijkNetherlands
  4. 4.INAF-NapoliNapoliItaly
  5. 5.INAF-PadovaPadovaItaly

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