期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 397, 期 1, 页码 L92-L95出版社
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1745-3933.2009.00691.x
关键词
black hole physics; galaxies: individual: M31; X-rays: binaries; X-rays: general
资金
- ESA
- USA (NASA)
- STFC Rolling Grant
- Science and Technology Facilities Council [ST/G002533/1, PP/D000963/1] Funding Source: researchfish
- STFC [PP/D000963/1, ST/G002533/1] Funding Source: UKRI
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 (L(Edd)). However, the unabsorbed 0.3-10 keV luminosity of XBo 144 was similar to 0.30 L(Edd) for a 1.4 M(circle dot) neutron star, and the 0.01-1000 keV luminosity is expected to be greater than or similar to 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.
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