X-ray source populations in the Andromeda Galaxy: first results from XMM-Newton survey

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present the results from XMM-Newton survey of the Andromeda Galaxy (M31). We discovered more than a hundred of new X-ray sources; some of them appeared to be bright X-ray transients. The unprecedented sensitivity of XMM-Newton allowed a detailed study of spectral properties and variability of new and previously known X-ray sources with luminosities above ~ 5 x 1036 ergs s-1. We review the X-ray properties of various classes of objects (X-ray transients, globular cluster sources, supernova remnants (SNR) and supersoft sources) detected in our survey. We present X-ray source luminosity distributions in the bulge and disk regions of M31. The disk in general is clearly lacking the brighter sources which dominate X-ray emission from the bulge. This is the first convincing evidence for a difference between bulge and disk X-ray populations in M31. Our results are in good qualitative agreement with the luminosity distributions for low- and high-mass X-ray binaries in our Galaxy.

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