Jet formation model from accretion disks of electron-ion-photon gas

TL;DR

This paper develops an analytical model for astrophysical jet formation from relativistic accretion disks composed of electron-ion-photon gas, revealing key properties of the jet-disk equilibrium and magnetic energy distribution.

Contribution

It introduces self-similar solutions for relativistic disk-jet structures considering photon and ion gases, extending previous models with a detailed plasma and magnetic field analysis.

Findings

Magnetic energy in jets exceeds that in disks by several orders of magnitude.

Jets are locally super-Alfvénic with plasma-beta less than 1 near the axis.

Derived solutions link jet properties to accretion disk parameters in binary systems.

Abstract

The problem of Astrophysical Jet formation from relativistic accretion disks through the establishment of relativistic disk-powerful jet equilibrium structure is studied applying the Beltrami-Bernoulli equilibrium approach of Shatashvili & Yoshida 2011; Arshilava et al. 2019. Accretion disk is weakly magnetized consisting of fully ionized relativistic electron-ion plasma and photon gas strongly coupled to electrons due to Thompson Scattering. %hence, making the behavior of photon gas similar to that of "a charged fluid". Analysis is based on the generalized Shakura-Sunyaev $\alpha $-turbulent dissipation model for local viscosity (being the main source of accretion), in which the contributions from both the photon and ion gases are taken into account. Ignoring the self-gravitation in the disk we constructed the analytical self-similar solutions for the equilibrium relativistic disk-jet structure characteristic parameters in the field of gravitating central compact object for the force-free condition. It is shown, that the magnetic field energy in the Jet is several orders greater compared to that of accretion disk, while jet-outflow is locally Super-Alfv\'enic with local {\it Plasma-beta} $< 1$ near the jet-axis. The derived solutions can be used to analyze the astrophysical jets observed in binary systems during the star formation process linking the jet properties with the parameters of relativistic accretion disks of electron-ion-photon gas.