Revealing the Nature of a very Luminous Globular Cluster X-Ray Source Bo375 in M31 Galaxy

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The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan

We present results of observations of a very luminous M31 globular cluster (GC) X-ray source Bo375 with Suzaku, Chandra, XMM-Newton and Swift. Bo375 is one of the most luminous GC X-ray sources in M31 (Andromeda Galaxy), and has a luminosity consistently above 10(exp 38) ergs s(sup -1), which is much more luminous than typical GCs found in our own Milky Way galaxy (the brightest GC X-ray source in our Milky Way galaxy is in the order of 10(exp 37) ergs s(sup -1)). There are several possible explanations for such a high luminosity: 1) the source might contain multiple components; 2) the source radiation might be beamed; 3) the source might be an accreting black hole, and 4) the source might be an accreting neutron star. To investigate why Bo375 has such a high luminosity, we study the light curves, X-ray spectra, and timing properties of the source from the data taken by Suzaku, Chandra, XMM-Newton and Swift in detail. Previous observations showed that Bo375 has short-term and long-term variability. The Chandra HRC-I data also shows that the source is consistent with a single point source. In this paper, we will further present the new results from Suzaku, XMM-Newton and Swift, which might reveal the nature of Bo375, and of other luminous GCs in nearby galaxies.

Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science

資料番号: AA0064574104

レポート番号: JAXA-SP-09-008E

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