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arXiv 2109.07511astro-ph.HEastro-ph.SR
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X射线双星MAXI J1820 +070中的黑洞自旋轨道失准

Black hole spin-orbit misalignment in the X-ray binary MAXI J1820+070

Juri Poutanen, Alexandra Veledina, Andrei V. Berdyugin, Svetlana V. Berdyugina, Helen Jermak, Peter G. Jonker, Jari J. E. Kajava, Ilia A. Kosenkov, Vadim Kravts… 展开作者

Juri Poutanen, Alexandra Veledina, Andrei V. Berdyugin, Svetlana V. Berdyugina, Helen Jermak, Peter G. Jonker, Jari J. E. Kajava, Ilia A. Kosenkov, Vadim Kravtsov, Vilppu Piirola, Manisha Shrestha, Manuel A. P. Torres, Sergey S. Tsygankov

摘要:

X射线双星系统中黑洞的观测特征依赖于黑洞的质量、自旋、吸积率以及黑洞自旋与轨道角动量的失调角。本文介绍了黑洞X射线双星MAXI J1820+070的光学偏振观测结果,并由此确定了双星轨道轴的位置角。结合这与以前的相对论性喷流方向轴,跟踪黑洞自旋,和轨道的倾斜度的测定,我们确定了一个40度的自旋轨道错位角的下限。这种错位必须来自双星或黑洞的形成阶段。如果其他X射线双星也有类似的大偏差,这将使X射线观测对黑洞质量和自旋的测量产生偏差。

英文摘要:

The observational signatures of black holes in x-ray binary systems depend on their masses, spins, accretion rate and the misalignment angle between the black hole spin and the orbital angular momentum. We present optical polarimetric observations of the black hole x-ray binary MAXI J1820+070, from which we constrain the position angle of the binary orbital axis. Combining this with previous determinations of the relativistic jet orientation axis, which traces the black hole spin, and the inclination of the orbit, we determine a lower limit of 40 deg on the spin-orbit misalignment angle. The misalignment has to originate from either the binary or black hole formation stage. If other x-ray binaries have similarly large misalignments, these would bias measurements of black hole masses and spins from x-ray observations.

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