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arXiv 1406.6091astro-ph.HE
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50个M31黑洞候选者被钱德拉和XMM-牛顿发现

50 M31 black hole candidates identified by Chandra and XMM-Newton

R. Barnard, M. R. Garcia, F. Primini, S. S. Murray

摘要:

在过去的5年中,我们已经确定了35个黑洞候选者(BHC)在M31从他们的X射线光谱。我们的BHC表现出0.3- 10 keV的光谱与X射线双星(XB)硬态一致,在亮度的上限以上的中子星(NS)XB。当我们的BHC光谱模拟与磁盘黑体+黑体模型,与明亮的NS XB相比,我们发现,BHC居住在不同的参数空间的NS XB。然而,BH XB也可能表现出在NS XB中从未见过的热主导(TD)状态;这种TD状态最常在X射线瞬变中观察到。我们在钱德拉对M31的调查中检查了约50个X射线瞬变,发现13个具有适合分析的光谱。我们还检查了我们调查视野之外的两个BHC,在球状星团B 045和B375中。我们有42个强BHC,和8个可能从进一步观察中受益的合理BHC。在球状星团的15个BHC中,有12个与NS光谱相差大于5 σ。由于我们分析的改进,我们已经将10种先前确定的可能的BHC升级为强BHC。在M31* 6'范围内的33个X射线瞬变的平均最大占空比为0.13;我们估计在这个区域中超过40%的XBs包含BH吸积体。值得注意的是,我们估计BHC贡献了>90%的>1 E+38 erg/s的XB。

英文摘要:

Over the last ~5 years we have identified ~35 black hole candidates (BHCs) in M31 from their X-ray spectra. Our BHCs exhibited 0.3--10 keV spectra consistent with the X-ray binary (XB) hard state, at luminosities that are above the upper limit for neutron star (NS) XBs. When our BHC spectra were modeled with a disk blackbody + blackbody model, for comparison with bright NS XBs, we found that the BHCs inhabited a different parameter space to the NS XBs. However, BH XBs may also exhibit a thermally dominated (TD) state that has never been seen in NS XBs; this TD state is most often observed in X-ray transients. We examined the ~50 X-ray transients in our Chandra survey of M31, and found 13 with spectra suitable for analysis. We also examined 2 BHCs outside the field of view of our survey, in the globular clusters B045 and B375. We have 42 strong BHCs, and 8 plausible BHCs that may benefit from further observation. Of our 15 BHCs in globular clusters, 12 differ from NS spectra by >5 sigma. Due to improvements in our analysis, we have upgraded 10 previously identified plausible BHCs to strong BHCs. The mean maximum duty cycle of the 33 X-ray transients within 6' of M31* was 0.13; we estimate that >40% of the XBs in this region contain BH accretors. Remarkably, we estimate that BHCs contribute >90% of those XBs >1 E+38 erg/s.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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