Thermally Driven Winds from Radiatively Inefficient Accretion Flows

Abstract

Radiatively inefficient accretion flows (RIAFs) are common feature of low-luminosity accretion flows, including quiescent states of X-ray binaries and low-lunimosity active galactic nuclei. Thermally driven winds are expected from such hot accretion flows. By assuming that the flow has self-similarity structure in the radial direction, we solve the vertical structure of the wind and accretion flows simultaneously and evaluate the mass loss rates by wind. We find that the ratio of the outflow rate to the accretion rate is approximately unity for a viscosity parameter, alpha lesssim 0.1, despite some uncertainties in the angular momentum and temperature distributions. That is, the accretion rate in the RIAFs is roughly proportional to the radius. Moreover, we elucidate the effect of cooling by wind on the underneath accretion flow, finding that this effect could be important for calculating energy spectrum of the RIAF. Observational implications are briefly discussed in the context of Sgr A*.

15 pages, 5 figures, accepted by PASJ

References in corpus (10)

• Nonthermal Electrons in Radiatively Inefficient Accretion Flow Models of Sagittarius A*
• Interferometric Measurements of Variable 340 GHz Linear Polarization in Sagittarius A*
• Accretion of low angular momentum material onto black holes: 2D magnetohydrodynamical case
• Galactic Centre stellar winds and Sgr A* accretion
• Global Three-Dimensional Simulations of Black Hole Accretion Disks: X-ray Flares in the Plunging Region
• A Transition in the Accretion Properties of Radio-Loud Active Nuclei
• The Influences of Outflow on the Dynamics of Inflow
• A Note on the Slim Accretion Disk Model
• The pattern of accretion flow onto Sgr A*
• Disk Outflows and the Accretion Rate Gap

Cited by in corpus (10)

• Clumpy Outflow from Supercritical Accretion Flows
• On the structure of Accretion Disks with Outflows
• Hydrodynamical wind on a magnetized ADAF with thermal conduction
• The Effect of Large Scale Magnetic Field on Outflow in ADAFs: an Odd Symmetry Configuration
• The self-similar structure of advection-dominated discs with outflow and radial viscosity
• Viscous accretion of a polytropic self-gravitating disk in the presence of wind
• How does an asymmetric magnetic field change the vertical structure of a hot accretion flow?
• Structure of ADAFs in a general large-Scale B-field: The role of wind and thermal conduction
• Hydrodynamical wind on magnetized Accretion Flows with Convection
• Fourier analysis of advection-dominated accretion flows