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arXiv 1106.2502astro-ph.HE
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Swift J164449 .3+573451黑洞质量的X射线和射电约束

X-ray and Radio Constraints on the Mass of the Black Hole in Swift J164449.3+573451

J. M. Miller, K. Gultekin

摘要:

斯威夫特J 164449.3 +573451是一个令人兴奋的瞬态事件,可能是由一个巨大的黑洞对恒星的潮汐破坏提供动力。到源的距离,它的瞬态性质,以及高的内部柱密度,使估计黑洞质量的几种方法变得复杂。利用黑洞质量、射电光度和X射线光度之间的新改进关系,并对源通量进行去束,得到对黑洞质量的弱约束:log(M/Msun)= 5.5 +/- 1.1(1 sigma置信度)。置信区间是从当前内在的散射的关系,其中包括从X射线可变性和吸积模式的影响。这个质量范围很宽,但它包括与一些可变性论点一致的低值,并且安全地排除了黑洞不可能破坏恒星的高质量值。未来对黑洞质量、射电光度和X射线光度之间关系的改进将能够将相关质量估计的不确定性降低两倍,使这种技术与基于M-西格玛关系的估计相当。在放置这样的事件的基本平面上,其适用性的潜在的未来测试,和质量的不确定性所产生的变量X射线发射可能存在的困难进行了讨论。随着Pan-STARRS、LSST、LOFAR、Square Kilometer Array和eROSITA等近期和长期的调查工作开始探测到许多潮汐破裂事件,结合X射线和射电观测估计黑洞质量可能被证明是非常实用的。

英文摘要:

Swift J164449.3+573451 is an exciting transient event, likely powered by the tidal disruption of a star by a massive black hole. The distance to the source, its transient nature, and high internal column density serve to complicate several means of estimating the mass of the black hole. Utilizing newly-refined relationships between black hole mass, radio luminosity, and X-ray luminosity, and de-beaming the source flux, a weak constraint on the black hole mass is obtained: log(M/Msun) = 5.5 +/- 1.1 (1 sigma confidence). The confidence interval is determined from the current intrinsic scatter in the relation, which includes effects from X-ray variability and accretion modes. This mass range is broad, but it includes low values that are consistent with some variability arguments, and it safely excludes high mass values where it becomes impossible for black holes to disrupt stars. Future refinements in relationships between black hole mass, radio luminosity, and X-ray luminosity will be able to reduce the uncertainty in related mass estimates by a factor of two, making this technique comparable to estimates based on the M-sigma relationship. Possible difficulties in placing such events on the fundamental plane, a potential future test of their suitability, and uncertainties in mass stemming from variable X-ray emission are discussed. As near and longer-term survey efforts such as Pan-STARRS, LSST, LOFAR, the Square Kilometer Array, and eROSITA begin to detect many tidal disruption events, black hole mass estimates from combined X-ray and radio observations may prove to be very pragmatic.

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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