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arXiv 0905.3278astro-ph.HE
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用XMM-牛顿法识别了M31球状星团中的第二个候选黑洞

A second black hole candidate in a M31 globular cluster is identified with XMM-Newton

R. Barnard, U. Kolb

摘要:

我们使用的参数在以前的工作中,以确定第二个黑洞候选人与M31球状星团,Bo 144,X射线光谱和定时属性的基础上。2002年XMM-牛顿对相关X射线源(以下简称XBo 144)的观测揭示了所有低质量X射线双星(LMXB)在低硬状态下的共同行为。研究表明,中子星LMXB在0.01-1000 keV光度<=10%爱丁顿极限(L_Edd)时表现出这种行为。然而,对于1.4 M太阳的中子星,未吸收的0.3-10 keV XBo 144的光度约为0.30 L Edd,而0.01-1000 keV的预期光度要高出3-7倍。因此,我们确定XBo 144是一个黑洞候选者。此外,它是第二个与GC中平均序列供体的潮汐捕获形成相一致的黑洞候选者;这样的系统以前虽然不存在,因为供体被认为在捕获过程中被破坏。

英文摘要:

We use arguments developed in previous work to identify a second black hole candidate associated with a M31 globular cluster, 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% of the Eddington limit (L_Edd). However, the unabsorbed 0.3-10 keV XBo 144 luminosity was ~0.30 L_Edd for a 1.4 M_sun neutron star, and the expected 0.01-1000 keV luminosity is 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 mean sequence donor in a GC; such systems were previously though non-existent, because the donor was thought to be disrupted during the capture process.

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