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arXiv 1804.06014astro-ph.HEastro-ph.SR
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银河系中的黑洞/脉冲双星

Black Hole/Pulsar Binaries in the Galaxy

Yong Shao, Xiang-Dong Li

摘要:

我们对银盘中含有一个黑洞(BH)和一个中子星(NS)的双星的形成进行了粒子数合成计算。在计算过程中,对一些重要的输入参数进行了修正,特别是对常见包络演化的处理。讨论了银河系恒星形成率和NS反冲速度分布对BH/NS双星诞生率($ \sim 0.6-13 \rm\, Myr^{-1}$)的影响。从入射BH/NS双星出发,通过模拟由引力波辐射引起的轨道演化和NS作为射电星的演化,得到了BH/NS脉冲星双星的轨道周期、偏心率和脉冲周期等可观测参数的分布。我们估计银盘中可能存在$\sim 3-80 $ BH/脉冲星双星,其中约10%的双星可以被500米口径球面射电望远镜探测到。

英文摘要:

We have performed population synthesis calculation on the formation of binaries containing a black hole (BH) and a neutron star (NS) in the Galactic disk. Some of important input parameters, especially for the treatment of common envelope evolution, are updated in the calculation. We have discussed the uncertainties from the star formation rate of the Galaxy and the velocity distribution of NS kicks on the birthrate ($ \sim 0.6-13 \rm\, Myr^{-1}$) of BH/NS binaries. From incident BH/NS binaries, by modelling the orbital evolution duo to gravitational wave radiation and the NS evolution as radio pulsars, we obtain the distributions of the observable parameters such as the orbital period, eccentricity and pulse period of the BH/pulsar binaries. We estimate that there may be $\sim 3-80 $ BH/pulsar binaries in the Galactic disk and around 10\% of them could be detected by the Five-hundred-meter Aperture Spherical radio Telescope.

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