Computation of mass loss from viscous accretion disc in presence of cooling

TL;DR

This paper models how viscous accretion discs with synchrotron cooling influence mass loss rates and jet formation, linking disc spectra with outflow rates and explaining observed jet powers in black hole systems.

Contribution

It introduces a formalism to compute mass loss from viscous, cooling accretion discs, highlighting the impact of cooling on jet generation and disc-outflow connection.

Findings

Cooling reduces the mass outflow rate.

Higher viscosity can still produce jets with cooling.

The model can explain observed jet powers in black holes.

Abstract

Rotating accretion flow may undergo centrifugal pressure mediated shock transition even in presence of various dissipative processes, such as viscosity and cooling mechanism. The extra thermal gradient force along the vertical direction in the post shock flow drives a part of the accreting matter as bipolar outflows which are believed to be the precursor of relativistic jets. We compute mass loss rates from a viscous accretion disc in presence of synchrotron cooling in terms of the inflow parameters. We show cooling significantly affects the mass outflow rate, to the extent that, jets may be generated from flows with higher viscosity. We discuss that our formalism may be employed to explain observed jet power for a couple of black hole candidates. We also indicate that using our formalism, it is possible to connect the spectral properties of the disc with the rate of mass loss.