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arXiv 0912.1209astro-ph.HEastro-ph.CO
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测量OJ287中主黑洞的自旋

Measuring the spin of the primary black hole in OJ287

M. J. Valtonen, S. Mikkola, D. Merritt, A. Gopakumar, H. J. Lehto, T. Hyvönen, H. Rampadarath, R. Saunders, M. Basta, R. Hudec

摘要:

OJ 287中的致密双星系统被模拟为包含一个带有吸积盘的旋转主黑洞和一个不旋转的次级黑洞。利用包含2.5PN精确非自旋贡献项、首阶广义相对论项和经典自旋轨道项的后牛顿(PN)精确方程,计算了OJ 287中双星黑洞的轨道,正如所料,它依赖于主黑洞的自旋.使用轨道解,具体的时间时,次级的轨道交叉的吸积盘的主要的评估,以便观察到的爆发记录,从1913年到2007年再现。爆发的时间对自旋值非常敏感。为了重现所有已知的爆发,包括1957年新发现的一个,主爆发的克尔参数必须是$0.28 \pm 0.08$。四极矩对运动方程的贡献使我们能够将“无毛”参数约束为$1.0\:\pm\:0.3$,其中0.3是1 σ误差。这在可达到的精度范围内支持“黑洞无毛定理”。到2015年下一次爆发时,应该有可能检验目前的估计。2015年爆发的时间是自旋的一个强函数:如果自旋是广义相对论允许的最大值的0.36,爆发开始于2015年11月初,而如果自旋是0.2,同一事件开始于2016年1月底

英文摘要:

The compact binary system in OJ287 is modelled to contain a spinning primary black hole with an accretion disk and a non-spinning secondary black hole. Using Post Newtonian (PN) accurate equations that include 2.5PN accurate non-spinning contributions, the leading order general relativistic and classical spin-orbit terms, the orbit of the binary black hole in OJ287 is calculated and as expected it depends on the spin of the primary black hole. Using the orbital solution, the specific times when the orbit of the secondary crosses the accretion disk of the primary are evaluated such that the record of observed outbursts from 1913 up to 2007 is reproduced. The timings of the outbursts are quite sensitive to the spin value. In order to reproduce all the known outbursts, including a newly discovered one in 1957, the Kerr parameter of the primary has to be $0.28 \pm 0.08$. The quadrupole-moment contributions to the equations of motion allow us to constrain the `no-hair' parameter to be $1.0\:\pm\:0.3$ where 0.3 is the one sigma error. This supports the `black hole no-hair theorem' within the achievable precision. It should be possible to test the present estimate in 2015 when the next outburst is due. The timing of the 2015 outburst is a strong function of the spin: if the spin is 0.36 of the maximal value allowed in general relativity, the outburst begins in early November 2015, while the same event starts in the end of January 2016 if the spin is 0.2

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