Barnard, R. and Kolb, U.
(2009).
| DOI (Digital Object Identifier) Link: | http://dx.doi.org/doi:10.1111/j.1745-3933.2009.00691.x |
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| Google Scholar: | Look up in Google Scholar |
Abstract
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 |
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| Copyright Holders: | 2009 The Authors |
| ISSN: | 0035-8711 |
| Funders: | STFC |
| 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) |
| Related URLs: | |
| Item ID: | 24409 |
| Depositing User: | Ulrich Kolb |
| Date Deposited: | 03 Nov 2010 12:59 |
| Last Modified: | 16 Nov 2012 16:36 |
| URI: | http://oro.open.ac.uk/id/eprint/24409 |
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