Barnard, R. and Kolb, U.
|DOI (Digital Object Identifier) Link:||http://dx.doi.org/doi:10.1111/j.1745-3933.2009.00691.x|
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We use arguments developed in previous work to identify a second black hole candidate associated with an M31 globular cluster (GC), Bo 144, on the basis of X-ray spectral and timing properties. The 2002 XMM–Newton observation of the associated X-ray source (hereafter XBo 144) revealed behaviour that is common to all low-mass X-ray binaries (LMXBs) in the low-hard state. Studies have shown that neutron star LMXBs exhibit this behaviour at 0.01–1000 keV luminosities ≤10 per cent of the Eddington limit (LEdd). However, the unabsorbed 0.3–10 keV luminosity of XBo 144 was ~0.30 LEdd for a 1.4 M⊚ neutron star, and the 0.01–1000 keV luminosity is expected to be ≳3–7 times higher. We therefore identify XBo 144 as a black hole candidate. Furthermore, it is the second black hole candidate to be consistent with formation via tidal capture of a main sequence donor in a GC; such systems were previously thought non-existent, because the donor was thought to be disrupted during the capture process.
|Item Type:||Journal Article|
|Copyright Holders:||2009 The Authors|
|Extra Information:||Please note: not all the mathematical symbols used in the abstract can be displayed|
|Keywords:||black hole physics; galaxies: individual: M31; X-rays: binaries; X-rays: general|
|Academic Unit/Department:||?? scie-phya ??
Science > Physical Sciences
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Ulrich Kolb|
|Date Deposited:||03 Nov 2010 12:59|
|Last Modified:||16 Nov 2012 16:36|
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