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 ∼0.05 M_☉ 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.

中文翻译：

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中子星-黑洞双星系统合并过程中可能出现的电磁现象

考虑了在中子星黑洞双星合并期间产生电磁辐射的可能模型。中子星和黑洞合并期间黑洞周围的剩余圆盘质量是通过考虑中子星的状态方程和合并之前的二元分量旋转来计算的。通过人口综合方法计算出聚结之前的二元系统参数（质量比，分量旋转，中子星磁场）。合并后，黑洞周围剩余盘的推导质量用于估计由Blandford-Znajek机理发射的相对论射流的动能。磁盘质量大于〜0.05 _M☉形成短伽马射线爆发所需的能量显示在不超过1％至10％的结合中（取决于状态方程）。效率较低的常用包络（大参数_αCE）导致天体物理学上有趣的EM能量释放的事件百分比显着增加。对于质量比较大的双星，其中磁化的中子星在聚结之前不会受到潮汐破坏，因此考虑了形成带电旋转黑洞（瓦尔德电荷）的可能性，并估算了释放的最大EM功率在合并后，通过这样的黑洞来实现。讨论了在聚结前阶段，在凝聚的脉冲星-黑洞双星中产生的相对论性轻子等离子体中，发射的引力波向电磁波的转换。