Spectrum of jet emitting disc: Application to microquasar XTE J1118+480

TL;DR

This paper develops a model for jet-emitting accretion discs around black holes, analyzing their energy balance and spectral energy distributions, and successfully explains the spectra of microquasar XTE J1118+480 in its hard state.

Contribution

It introduces a self-consistent thermal equilibrium model for jet-emitting discs considering multiple radiative processes, applied to explain microquasar spectra.

Findings

The hot JED model explains microquasar spectra in hard states.

Three thermal solutions are found, with stable cold and hot states.

Application to XTE J1118+480 demonstrates model's effectiveness.

Abstract

Under the framework of the magnetized accretion ejection structures, we analyze the energy balance properties, and study the spectral energy distributions (SEDs) of the Jet Emitting Disc (JED) model for black hole X-ray transients. Various radiative processes are considered, i.e. synchrotron, bremsstrahlung, and their Comptonizations, and external Comptonization of radiation from outer thin disc. With these cooling terms taken into account, we solve the thermal equilibrium equation self-consistently and find three solutions, of which the cold and the hot solutions are stable. Subsequently we investigate the theoretical SEDs for these two stable solutions.We find the hot JED model can naturally explain the spectra of the Galactic microquasars in their hard states. As an example, we apply this model to the case of XTE J1118+480.