Type Ia Supernova Rate in the Galactic Center Region
Abstract
According to recent analyses of the type-Ia supernova rate as a function of redshift, delayed and prompt type-Ia supernovae (SN Ia) should explode respectively in the Galactic bulge and in the nuclear bulge, a gas rich structure with ongoing star formation, located in the central region of the Milky Way. We estimate the rate of type-Ia supernovae in the Galactic bulge and nuclear bulge. We show that this rate is insufficient by an order of magnitude to explain by positron escape from type-Ia supernovae envelopes alone the large positron injection rate into the Galactic central region, as re-observed recently by the Spectrometer on INTEGRAL, which amounts to 1.25 10^{43} e+ s^{-1} and would require 0.5 SN Ia explosions per century.
Cite
@article{arxiv.astro-ph/0609566,
title = {Type Ia Supernova Rate in the Galactic Center Region},
author = {Stephane Schanne and Michel Casse and Patrick Sizun and Bertrand Cordier and Jacques Paul},
journal= {arXiv preprint arXiv:astro-ph/0609566},
year = {2007}
}
Comments
5 pages, 3 figures. Accepted for publication in ESA SP-622 (Proceedings of the 6th INTEGRAL Workshop, Moscow, 2006 07 03-07)