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Possible models for the generation of electromagnetic (EM) radiation duringthe coalescence of neutron star-black hole binaries are considered. The mass ofthe remnant disk around the black hole during the coalescence of neutron starsand black holes is calculated by taking into account the equation of state forneutron stars and the rotation of the binary components before the coalescence.The parameters of binary systems before the coalescence (the mass ratio, thecomponent rotation, the neutron star magnetic field) are calculated by thepopulation synthesis method. The derived mass of the remnant disk around theblack hole after the coalescence is used to estimate the kinetic energy of therelativistic jet launched by the Blandford-Znajek mechanism. A disk mass ofmore than $\sim 0.05 M_\odot$ required for the formation of short gamma-raybursts 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 largeparameter $\alpha_{CE}$) lead to a noticeably larger percentage of events withastrophysically interesting EM energy release. For binaries with a large massratio, in which a magnetized neutron star is not subjected to tidal disruptionbefore the coalescence, the possibility of the formation of an electricallycharged rotating black hole (Wald charge) is considered and estimates of themaximum EM power released by such a black hole after the coalescence are made.The conversion of the emitted gravitational waves into electromagnetic ones inthe relativistic lepton plasma generated in coalescing pulsar-black holebinaries at the pre-coalescence stage is discussed.

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