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arXiv 0910.5253astro-ph.HE
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到黑洞的第一个精确视差距离

The first accurate parallax distance to a black hole

J. C. A. Miller-Jones, P. G. Jonker, V. Dhawan, W. Brisken, M. P. Rupen, G. Nelemans, E. Gallo

摘要:

利用天体测量VLBI观测,我们已经确定黑洞X射线双星V404 Cyg的视差为0.418 +/- 0.024毫角秒,对应的距离为2.39 +/- 0.14 kpc,明显低于以前接受的值。这个独立于模型的估计是迄今为止测量到的银河系恒星质量黑洞的最准确距离。有了这个新的距离,我们证实了在1989年的爆发中,源不是超级爱丁顿。拟合的距离和自行意味着这个系统中的黑洞可能形成于超新星,其特有的速度与反冲(Blaauw)踢一致。在22 GHz下,推测该系统中存在的静止喷流的大小小于1.4 AU。对这类系统进行更大样本的天体测量观测,将有助于深入了解吸积恒星质量黑洞的形成和性质。

英文摘要:

Using astrometric VLBI observations, we have determined the parallax of the black hole X-ray binary V404 Cyg to be 0.418 +/- 0.024 milliarcseconds, corresponding to a distance of 2.39 +/- 0.14 kpc, significantly lower than the previously accepted value. This model-independent estimate is the most accurate distance to a Galactic stellar-mass black hole measured to date. With this new distance, we confirm that the source was not super-Eddington during its 1989 outburst. The fitted distance and proper motion imply that the black hole in this system likely formed in a supernova, with the peculiar velocity being consistent with a recoil (Blaauw) kick. The size of the quiescent jets inferred to exist in this system is less than 1.4 AU at 22 GHz. Astrometric observations of a larger sample of such systems would provide useful insights into the formation and properties of accreting stellar-mass black holes.

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