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

Yoshioka, Shogo,   Mineshige, Shin,   Ohsuga, Ken,   Kawashima, Tomohisa,   & Kitaki, Takaaki

要旨

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 on to the black hole (Ṁ_BH). We find that the ṁ_BH(≡Ṁ_BHc²∕L_Edd) dependence of L_rad∕L_Edd and L_mech∕L_Edd found for a stellar-mass black hole can apply to the high-mass cases, where L_rad is the radiation luminosity, L_mech is the mechanical luminosity, c is the speed of light, and L_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_mech^ISO∕L_Edd (evaluated by normalized density and velocity at θ = 10^∘) exhibits a broken power- law relationship with ṁ_BH; L_mech^ISO∕L_Edd ∝ṁ_BH^2.7 (or ∝ṁ_BH^0.7) below (above) ṁ_BH ~ 400. This is because the radial velocity stays nearly constant (or even decreases) below (above) the break with increase of ṁ_BH. We also find that the luminosity ratio is L_mech∕L_rad^ISO ~ 0.05 at ṁ_BH ~ 100, which is roughly consistent with the observations of NLS1, 1H 0323+103.