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arXiv 1002.2211astro-ph.HE
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软X射线瞬变A0620 -00中黑洞的自旋

The Spin of the Black Hole in the Soft X-ray Transient A0620--00

Lijun Gou, Jeffrey E. McClintock, James F. Steiner, Ramesh Narayan, Andrew G. Cantrell, Charles D. Bailyn, Jerome A. Orosz

摘要:

在1975- 1976年长达一年的爆发中,瞬变源A0620- 00的强度达到了50克拉布,这是任何X射线双星的历史记录。从那以后,消息来源一直处于静止状态。我们最近确定了黑洞质量、轨道倾角和距离的精确值。基于这些结果,我们测量了半径的吸积盘周围的黑洞主要通过拟合其热连续谱的相对论诺维科夫-索恩薄盘模型的版本。我们由此估计了黑洞的自旋。虽然我们的自旋估计依赖于OSO-8在1975年获得的单一高质量光谱,但我们对我们的结果充满信心,因为我们已经对其他源(H1743-322,XTE J1550-564,特别是LMC X-3)的数百次观测获得了一致的内盘半径值。我们已经确定了黑洞的无量纲自旋参数为a*=0.12+/-0.19,在3 sigma置信水平下a*<0.49和a*>-0.59。这一结果考虑到了观测和模型参数不确定性的所有来源。尽管低自旋,射电对应物的强度和性质,无论是在爆发还是平静中,都证明了强喷流的存在。如果喷流是由黑洞自旋驱动的,那么目前的模型表明,喷流功率应该是a* 的急剧增加的函数。因此,A0620- 00的低尾旋表明它的喷流可能是盘驱动的。

英文摘要:

During its yearlong outburst in 1975--76, the transient source A0620--00 reached an intensity of 50 Crab, an all-time record for any X-ray binary. The source has been quiescent since. We recently determined accurate values for the black hole mass, orbital inclination angle and distance. Building on these results, we have measured the radius of the inner edge of the accretion disk around the black hole primary by fitting its thermal continuum spectrum to our version of the relativistic Novikov-Thorne thin-disk model. We have thereby estimated the spin of the black hole. Although our spin estimate depends on a single high quality spectrum, which was obtained in 1975 by OSO-8, we are confident of our result because of the consistent values of the inner-disk radius that we have obtained for hundreds of observations of other sources: H1743-322, XTE J1550-564, and notably LMC X-3. We have determined the dimensionless spin parameter of the black hole to be a*=0.12+/-0.19, with a*<0.49 and a*>-0.59 at the 3 sigma level of confidence. This result takes into account all sources of observational and model-parameter uncertainties. Despite the low spin, the intensity and properties of the radio counterpart, both in outburst and quiescence, attest to the presence of a strong jet. If jets are driven by black hole spin, then current models indicate that jet power should be a steeply increasing function of a*. Consequently, the low spin of A0620--00 suggests that its jet may be disk-driven.

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