2002/03/14 by Sergey Trudolyubov, S. Trudolyubov, Konstantin Borozdin +7 · 2 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Galaxies: Formation, Evolution, Phenomena #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1086/341131
published as Astrophys.J. 571 (2002) L17-L21 · 5 pages, 2 figures, uses emulateapj.sty, Submitted to ApJL
arxiv created 2002/03/14 · openalex publication_date 2002/05/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We present luminosity distributions for the X-ray sources detected with XMM-Newton in the bulge and disk of the Andromeda galaxy (M31). The disk is clearly lacking the bright sources that dominate X-ray emission from the bulge. This is the first convincing evidence of 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 recently obtained by Grimm, Gilfanov, & Sunyaev for our Galaxy. The data presented here confirm that X-ray population of the disk of M31 is dominated by faint high-mass X-ray binary sources, while the bulge is populated with bright low-mass X-ray binaries.