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• W2062819983 abstract "CXOM31 J004252.030+413107.87 is one of the brightest X-ray sources within the D_25 region of M31, and associated with a globular cluster (GC) known as B135; we therefore call this X-ray source XB135. XB135 is a low mass X-ray binary (LMXB) that apparently exhibited hard state characteristics at 0.3--10 keV luminosities 4--6 E+38 erg/s, and the hard state is only observed below ~10% Eddington. If true, the accretor would be a high mass black hole (BH) (> ~50 M_Sun); such a BH may be formed from direct collapse of a metal-poor, high mass star, and the very low metalicity of B135 (0.015 Z_Sun) makes such a scenario plausible. We have obtained new XMM-Newton and Chandra HRC observations to shed light on the nature of this object. We find from the HRC observation that XB135 is a single point source located close to the center of B135. The new XMM-Newton spectrum is consistent with a rapidly spinning ~10--20 M_Sun BH in the steep power law or thermal dominant state, but inconsistent with the hard state that we previously assumed. We cannot formally reject three component emission models that have been associated with high luminosity neutron star LMXBs (known as Z-sources); however, we prefer a BH accretor. We note that deeper observation of XB135 could discriminate against a neutron star accretor." @default.
• W2062819983 created "2016-06-24" @default.
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• W2062819983 date "2015-03-25" @default.
• W2062819983 modified "2023-09-23" @default.
• W2062819983 title "XMM-NEWTONANDCHANDRAOBSERVATIONS OF THE M31 GLOBULAR CLUSTER BLACK HOLE CANDIDATE XB135: A HEAVYWEIGHT CONTENDER CUT DOWN TO SIZE" @default.
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• W2062819983 doi "https://doi.org/10.1088/0004-637x/802/2/85" @default.
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