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• W2138603295 abstract "We have conducted Chandra observations of ~2560 square arcmin (~131 kpc^2) of of M31, and find that the most luminous X-ray sources in our fields are in globular clusters (GCs). Of the 28 GC X-ray sources in our fields, 17 are newly discovered. Approximately 1/3 of all the sources have L_x([0.5-7] keV) > 10^{37} ergs/s; approximately 1/10 of all the sources have L_x([0.5-7] keV) close to or above 10^{38} erg/s. The most luminous source, in the globular cluster Bo 375, is consistently observed to have L_x greater than 2 x 10^{38} ergs/s. (1) We present data on the spectra and/or light curves of the 5 most luminous M31 GC sources. (2)We explore possible explanations for the high X-ray luminosities of the brightest sources. These include that the X-ray sources may be composites, the radiation we receive may be beamed, metallicity effects could be at work, or the sources may be accreting black holes. We weigh each of these possibilities against the data. In addition, we introduce a neutron star model in which mass transfer proceeds on the thermal time scale of the donor star. Our model can produce luminosities of several times 10^{38} ergs/s, and leads to a set of well-defined predictions. (3) We compute the X-ray luminosity function and the distribution of counts in wavebands that span the range of energies to which Chandra is sensitive. We find the peak X-ray luminosity is higher and that systems with L_x > 10^{37} ergs/s constitute a larger fraction of all GC sources than in the MW. (4) We study the possible reasons for this difference between M31 and Galactic GC X-ray sources and identify three promising explanations." @default.
• W2138603295 created "2016-06-24" @default.
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• W2138603295 date "2002-05-10" @default.
• W2138603295 modified "2023-09-27" @default.
• W2138603295 title "Bright X‐Ray Sources in M31 Globular Clusters" @default.
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• W2138603295 doi "https://doi.org/10.1086/339283" @default.
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