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Astronomy Letters

, Volume 30, Issue 3, pp 140–147 | Cite as

The origin of intergalactic thermonuclear supernovae

  • A. G. Kuranov
  • K. A. Postnov
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Abstract

The population synthesis method is used to study the possibility of explaining the appreciable fraction of the intergalactic type-Ia supernovae (SN Ia), 20 −15 +12 %, observed in galaxy clusters (Gal-Yam et al. 2003) when close white dwarf binaries merge in the cores of globular clusters. In a typical globular cluster, the number of merging double white dwarfs does not exceed ∼10−13 per year per average cluster star in the entire evolution time of the cluster, which is a factor of ∼3 higher than that in a Milky-Way-type spiral galaxy. From 5 to 30% of the merging white dwarfs are dynamically expelled from the cluster with barycenter velocities up to 150 km s−1. SN Ia explosions during the mergers of double white dwarfs in dense star clusters may account for ∼1% of the total rate of thermonuclear supernovae in the central parts of galaxy clusters if the baryon mass fraction in such star clusters is ∼0.3%.

Key words

supernovae globular clusters stellar evolution 
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Copyright information

© MAIK "Nauka/Interperiodica" 2004

Authors and Affiliations

  • A. G. Kuranov
    • 1
  • K. A. Postnov
    • 1
  1. 1.Sternberg Astronomical InstituteMoscowRussia

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