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We present luminosity distributions for the X-ray sources detected withXMM-Newton in the bulge and disk of the Andromeda Galaxy (M31). The disk isclearly lacking the brighter sources which dominate X-ray emission from thebulge. This is the first convincing evidence for a difference between bulge anddisk X-ray populations in M31. Our results are in good qualitative agreementwith the luminosity distributions for low- and high-mass X-ray binariesrecently obtained by Grimm et al.(2001) for our Galaxy. This confirms thatX-ray population of the disk of M31 is dominated by fainter HMXB sources, whilethe bulge is populated with brighter LMXBs.Comment: 5 pages, 2 figures, uses emulateapj.sty, Submitted to ApJ

On the X-Ray Source Luminosity Distributions in the Bulge and Disk of M31: First Results from the [ITAL]XMM-Newton[/ITAL] Survey