Radiatively driven general relativistic jets

TL;DR

This paper models relativistic jets around black holes using radiation hydrodynamics, showing how radiation and thermal effects accelerate jets to high speeds and induce shocks near the horizon.

Contribution

It introduces a relativistic radiation hydrodynamics framework for jet dynamics in curved spacetime, revealing the combined effects of thermal and radiative driving on jet acceleration.

Findings

Jets reach speeds up to 0.75c due to combined thermal and radiative forces.

Radiation from the accretion disc can induce internal shocks near the black hole horizon.

The model accounts for curved spacetime effects on jet acceleration.

Abstract

We use moment formalism of relativistic radiation hydrodynamics to obtain equations of motion of radial jets and solve them using polytropic equation of state of the relativistic gas. We consider curved space-time around black holes and obtain jets with moderately relativistic terminal speeds. In addition, the radiation field from the accretion disc, is able to induce internal shocks in the jet close to the horizon. Under combined effect of thermal as well as radiative driving, terminal speeds up to 0.75 (units of light speed) are obtained.