Black Hole’s Spin-Dependence of γ-Ray and Neutrino Emissions from MAXI J1820+070, XTE J1550-564, and XTE J1859+226

Abstract

A black hole’s spin effects on the jet emissions of high-energy neutrinos and γ-rays from black hole X-ray binary systems (BHXRBs) are investigated. The BHXRBs consist of a stellar black hole, a companion (donor) star, a BH accretion disk, a BH corona, and two jets emitted from the black hole perpendicular to the accretion disk. For their description, properties of the accretion disk, specifically the accretion disk’s inner radius Rin and the accretion disk’s temperature profile T(R), play key roles since they depend on the black hole’s dimensionless spin parameter α∗. In this work, we focus on the main reaction mechanisms taking place inside jets from which high-energy γ-rays and neutrinos are created. The intensities and integral fluxes of neutrinos and γ-rays are obtained by integrating the respective source functions. Lastly, the γ-ray absorption due to e−-e+ pair production is considered, particularly absorption from the accretion disk. For concrete applications, we have chosen the BHXRB systems MAXI J1820+070, XTE J1550-564, and XTE J1859+226.