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arXiv 2005.14309astro-ph.HE
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中子星-黑洞双星系统并合过程中可能的电磁现象

Possible Electromagnetic Phenomena during the Coalescence of Neutron Star-Black Hole Binary Systems

K. A. Postnov, A. G. Kuranov, I. V. Simkin

摘要:

考虑了中子星-黑洞双星合并过程中电磁辐射产生的可能模型。考虑到中子星的状态方程和合并前双星的转动,计算了中子星与黑洞合并时黑洞周围残留盘的质量.用粒子数综合法计算了双星系统合并前的参数(质量比、组分转动、中子星磁场)。导出合并后的黑洞周围的残余盘的质量,用于估计由Blandford-Znajek机制发射的相对论性喷流的动能。在不超过1-10\%的聚结中(取决于状态方程)获得了形成短伽马射线暴所需的大于$\sim 0.05 M_\odot$的盘质量。效率较低的共同信封(一个大的参数$α_{CE}$)导致一个明显更大的百分比的事件与天体物理学有趣的EM能量释放。对于一个大的质量比的双星,其中磁化中子星不受潮汐破裂之前的合并,形成一个带电的旋转黑洞(沃尔德电荷)的可能性被认为是和估计的最大EM功率释放后,这样一个黑洞合并。讨论了脉冲星-黑洞双星在合并前的相对论轻子等离子体中引力波向电磁波的转换。

英文摘要:

Possible models for the generation of electromagnetic (EM) radiation during the coalescence of neutron star-black hole binaries are considered. The mass of the remnant disk around the black hole during the coalescence of neutron stars and black holes is calculated by taking into account the equation of state for neutron stars and the rotation of the binary components before the coalescence. The parameters of binary systems before the coalescence (the mass ratio, the component rotation, the neutron star magnetic field) are calculated by the population synthesis method. The derived mass of the remnant disk around the black hole after the coalescence is used to estimate the kinetic energy of the relativistic jet launched by the Blandford-Znajek mechanism. A disk mass of more than $\sim 0.05 M_\odot$ required for the formation of short gamma-ray bursts is shown to be obtained in no more than 1-10\% of the coalescences (depending on the equation of state). Less efficient common envelopes (a large parameter $α_{CE}$) lead to a noticeably larger percentage of events with astrophysically interesting EM energy release. For binaries with a large mass ratio, in which a magnetized neutron star is not subjected to tidal disruption before the coalescence, the possibility of the formation of an electrically charged rotating black hole (Wald charge) is considered and estimates of the maximum EM power released by such a black hole after the coalescence are made. The conversion of the emitted gravitational waves into electromagnetic ones in the relativistic lepton plasma generated in coalescing pulsar-black hole binaries at the pre-coalescence stage is discussed.

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