X-Rays Beware: The Deepest Chandra Catalogue of Point Sources in M31
N. Vulic, S. C. Gallagher, P. Barmby

TL;DR
This paper presents the most sensitive Chandra X-ray point source catalogue of M31, detecting 795 sources over 1 Ms of observations, and analyzes their luminosity functions to understand the galaxy's X-ray source populations.
Contribution
It provides the deepest Chandra X-ray catalogue of M31 with 795 sources, including 259 new detections, and offers detailed luminosity functions for different galaxy regions.
Findings
Detected 795 X-ray sources in M31 with high sensitivity.
Created the most sensitive X-ray luminosity functions for M31.
Found differences in XLF slopes between bulge and disk regions.
Abstract
This study represents the most sensitive Chandra X-ray point source catalogue of M31. Using 133 publicly available Chandra ACIS-I/S observations totalling ~1 Ms, we detected 795 X-ray sources in the bulge, northeast, and southwest fields of M31, covering an area of approximately 0.6 deg, to a limiting unabsorbed 0.5-8.0 keV luminosity of erg/s. In the inner bulge, where exposure is approximately constant, X-ray fluxes represent average values because they were determined from many observations over a long period of time. Similarly, our catalogue is more complete in the bulge fields since monitoring allowed more transient sources to be detected. The catalogue was cross-correlated with a previous XMM-Newton catalogue of M31's isophote consisting of 1948 X-ray sources, with only 979 within the field of view of our survey. We found 387 (49%) of our Chandra sources…
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