Radiation and outflow properties of super-Eddington accretion flows around various mass classes of black holes: Dependence on the accretion rates

2024/07/22 by Yoshioka, Shogo, Mineshige, Shin, Ohsuga, Ken +2 · 3 citations
#FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE)

paper · doi:10.48550/arxiv.2407.15927

Abstract

We perform axisymmetric two-dimensional radiation-hydrodynamic simulations of super-Eddington accretion flow and outflow around black holes to examine the properties of radiation and outflow as functions of the black hole mass and the accretion rate onto the black hole ( M_{\rm BH}). We find that the m_{\rm BH} (≡ M_{\rm BH}c² /L_{\rm Edd}) dependence of L_{\rm rad}/L_{\rm Edd} and L_{\rm mech}/L_{\rm Edd} found for stellar-mass black hole can apply to the high mass cases, where L_{\rm rad} is the radiation luminosity, L_{\rm mech} is the mechanical luminosity, c is the speed of light, and L_{\rm Edd} is the Eddington luminosity. Such universalities can appear in the regime, in which electron scattering opacity dominates over absorption opacity. Further, the normalized isotropic mechanical luminosity L_{\rm mech}^{\rm ISO}/L_{\rm Edd} (evaluated by normalized density and velocity at θ=10^∘) exhibits a broken power-law relationship with m_{\rm BH}; L_{\rm mech}^{\rm ISO}/ L_{\rm Edd} ∝ m_{\rm BH}^2.7 (or ∝ m_{\rm BH}^0.7) below (above) m_{\rm BH}∼ 400. This is because the radial velocity stays nearly constant (or even decreases) below (above) the break with increase of m_{\rm BH}. We also find that the luminosity ratio is L_{\rm mech}/L_{\rm rad}^{\rm ISO} ∼ 0.05 at m_{\rm BH} ∼ 100, which is roughly consistent with the observations of NLS1, 1H 0323+103.

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