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arXiv 2309.05018astro-ph.HE
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通过X射线反射光谱和相对论进动模型测量黑洞自旋:以XTE J1859+226为例

Measuring Black Hole Spins through X-ray Reflection Spectroscopy and the Relativistic Precession Model: the case of XTE J1859+226

Gitika Mall, Honghui Liu, Cosimo Bambi, James F. Steiner, Javier A. Garcia

AI总结:

本文针对XTE J1859+226,利用RXTE存档数据中的23条反射光谱,以relxill和relxillD模型重新测量黑洞自旋,得到约0.987的高自旋值,证实了X射线反射光谱与相对论进动模型两种方法之间存在系统性差异。

摘要:

发展精确测量黑洞自旋的技术对于研究这些天体的物理和天体物理学性质至关重要。X射线反射光谱是目前估算吸积黑洞自旋最常用的方法;迄今为止,它已提供了约40个X射线双星中的恒星级黑洞和40个活动星系核中的超大质量黑洞的自旋测量结果。相对论进动模型(RPM)是另一种测量恒星级黑洞自旋的方法:它需要测量三个同时出现的准周期振荡的频率,并有可能提供黑洞质量和自旋的精确估计。然而,当应用于相同源时,这两种方法似乎并未给出一致的结果,这使人们对这些测量的可靠性和准确性产生了质疑。最近,RPM被应用于推断XTE J1859+226中黑洞的自旋。作者发现$a_* = 0.149 \pm 0.005$(68%置信水平)。该源没有其他自旋测量结果。我们查找了XTE J1859+226的RXTE存档观测数据中具有模糊反射特征的数据,并找到了23条适合测量自旋的光谱。我们采用relxill和relxillD两种不同模型,并从所有这些拟合中获得了更高的自旋值。通过对7条更高质量光谱进行同时拟合,我们分别用relxill和relxillD得到$a_* = 0.986^{+0.001}_{-0.004}$和$a_* = 0.987 \pm 0.003$(90%置信水平,统计误差)。我们的结果证实了两种技术推断出的自旋测量值之间的差异。

英文摘要:

The development of techniques to measure accurately black hole spins is crucial to study the physics and astrophysics of these objects. X-ray reflection spectroscopy is currently the most popular method to estimate the spins of accreting black holes; so far it has provided a spin measurement of about 40 stellar-mass black holes in X-ray binaries and 40 supermassive black holes in active galactic nuclei. The relativistic precession model (RPM) is another method to measure the spins of stellar-mass black holes: it requires the measurement of the frequencies of three simultaneous quasi-periodic oscillations and can potentially provide precise estimates of the black hole mass and spin. However, the two methods do not seem to provide consistent results when applied to the same sources, which questions the reliability and accuracy of these measurements. Recently, the RPM has been applied to infer the spin of the black hole in XTE J1859+226. The authors found $a_* = 0.149 \pm 0.005$ (68% CL). There are no other spin measurements of this source. We looked for archived RXTE observations of XTE J1859+226 with blurred reflection features and found 23 spectra suitable for measuring the spin. We employed two different models with relxill and relxillD and obtained a higher spin value from all these fits. From simultaneous fitting of 7 spectra of higher quality, we found $a_* = 0.986^{+0.001}_{-0.004}$ and $a_* =0.987 \pm 0.003$ (90% CL, statistical) with relxill and relxillD, respectively. Our results confirm the discrepancy between the spin measurements inferred from the two techniques.

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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