The origin of intergalactic thermonuclear supernovae
Abstract
The population synthesis method is used to study the possibility of explaining the appreciable fraction (20+1215%) of the intergalactic (no-host) type Ia supernovae observed in galaxy clusters (Gal-Yam ete al. 2003) by binary whote dwarf merginngs in the cores of globular clusters. In a typical globular cluster, the number of merging double white dwarfs is fount to be smaller than 10-13 per year per average cluster star during the entire evolution of the cluster, which is a factor of 3 higher than in a Milky-Way-type galaxy. From 5 to 30% of the merging white dwarfs are dynamically expelled from the cluster with barycenter velocities up to 150 km/s. SN Ia explosions during the mergers of binary white dwarfs in dense star clusters may account for 1% of the total rate of SN Ia in the central parts of galaxy clusters if the baryon mass fraction in such star clusters is 0.3%.
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