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The origin of intergalactic thermonuclear supernovae | | A.G.Kuranov
; K.A. Postnov
; | | Date: |
22 Dec 2003 | | Journal: | Astron.Lett. 30 (2004) 140-147 | | Subject: | astro-ph | | Affiliation: | Sternberg Astronomical Institute, Moscow | | Abstract: | The population synthesis method is used to study the possibility of explaining the appreciable fraction (20^+12_15%) 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 sim 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 sim 0.3%. | | Source: | arXiv, astro-ph/0401452 | | Services: | Forum | Review | PDF | Favorites | |
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