Radiation Spectrum of a Magnetized Supercritical Accretion Disc with Thermal Conduction

TL;DR

This paper investigates how thermal conduction influences the observational spectra and luminosity of supercritical magnetized accretion discs, applying the model to black-hole X-ray binaries and Seyfert galaxies.

Contribution

It extends previous self-similar solutions to include thermal conduction effects on disc spectra and luminosity, considering magnetic fields and advection.

Findings

Thermal conduction reduces the disc's surface temperature and luminosity.

Spectra depend strongly on the inclination angle of the disc.

Surface temperature is highly sensitive to thermal conduction, magnetic fields, and advection.

Abstract

We examine the effect of thermal conduction on the observational properties of a super critical hot magnetized flow. We obtained self-similar solution of a magnetized disc when the thermal conduction plays an important role. Follow of our first paper (Ghasemnezhad et al. 2012 (hereafter GKA12)) we have extended our solution on the observational appearance of the disc to show how physical condition such as thermal conduction, viscosity, and advection will change the observed luminosity of the disc, Continuous spectra and surface temperature of such discs was plotted. We apply the present model to black-hole X-ray binary LMC X-3 and narrow-line seyfert 1 galaxies, which are supposed to be under critical accretion rate. Our results show clearly that the surface temperature is strongly depends on the thermal conduction, the magnetic field and advection parameter. However we see that thermal conduction acts to oppose the temperature gradient as we expect and observed luminosity of the disc will reduce when thermal conduction is high. We have shown that in this model the spectra of critical accretion flows strongly depends on the inclination angle.