Computer Science
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe..70b&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Computer Science
Galaxies
Scientific paper
We investigate the unresolved X-ray emission originating from the bulge of M31. We show that a part of this emission is due to a large number of faint sources - mainly accreting white dwarfs and active binaries, associated with the old stellar population, similar to the Galactic ridge X-ray emission of the Milky Way. We also detect soft X-ray emission from ionized gas. It has a temperature of 3-4 million K and its mass is about few million solar masses. The gas distribution is extended along the minor axis of the galaxy suggesting that it may be outflowing in the direction perpendicular to the disk of M31 at the rate of 0.1 solar masses per year. The mass and energy budget of this galactic wind is maintained by the mass loss from evolved stars and by the energy input from type Ia Supernovae. Based on the detailed study of the unresolved emission from M31, it becomes possible to put constraints on the progenitors of classical nova outbursts. The comparison between the gravitational energy, -- released by accreting white dwarfs -- and the observed X-ray luminosity, reveals the nature of the classical nova progenitors.
Bogdan Akos
Gilfanov Marat
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