2012/06/30 by Ramesh Narayan, Aleksander Sądowski, Aleksander Sadowski +3 · 505 citations
Engineering · Physics and Astronomy · #Accretion (finance) #Advection #Astrophysical Phenomena and Observations #Astrophysics #Black hole (networking) #Inflow #Magnetic field #Magnetohydrodynamics #Mechanics #Mechanics and Biomechanics Studies #Meteorology #Outflow #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #RADIUS #Schwarzschild radius #Spin-flip #astro-ph.HE
paper · pdf · doi:10.1111/j.1365-2966.2012.22002.x
published in Monthly Notices of the Royal Astronomical Society 426(4), 3241-3259 (Oxford University Press) · 20 pages, 21 figures, MNRAS, in press
arxiv created 2012/09/03 · openalex publication_date 2012/10/17 · arxiv updated 2015/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present results from two long-duration general relativistic magneto-hydrodynamic (GRMHD) simulations of advection-dominated accretion around a non-spinning black hole. The first simulation was designed to avoid significant accumulation of magnetic flux around the black hole. This simulation was run for a time of 200 000 GM/c3 and achieved inflow equilibrium out to a radius ∼90 GM/c2. Even at this relatively large radius, the mass outflow rate is found to be only 60 per cent of the net mass inflow rate into the black hole. The second simulation was designed to achieve substantial magnetic flux accumulation around the black hole in a magnetically arrested disc. This simulation was run for a shorter time of 100 000 GM/c3. Nevertheless, because the mean radial velocity was several times larger than in the first simulation, it reached inflow equilibrium out to a radius ∼170 GM/c2. Here, becomes equal to . Since the mass outflow rates in the two simulations do not show robust convergence with time, it is likely that the true outflow rates are lower than our estimates. The effect of black hole spin on mass outflow remains to be explored. Neither simulation shows strong evidence for convection, though a complete analysis including the effect of magnetic fields is left for the future.