Non Axisymmetric Relativistic Wind Accretion with Velocity Gradients onto a Rotating Black Hole

Abstract

We model, for the first time, the Bondi-Hoyle accretion of a fluid with velocity gradients onto a Kerr black hole, by numerically solving the fully relativistic hydrodynamics equations. Specifically, we consider a supersonic ideal gas, which has velocity gradients perpendicular to the relative motion. We measure the mass and specific angular accretion rates to illustrate whether the fluid presents unstable patterns or not. The initial parameters, we consider in this work, are the velocity gradient ${\epsilon }_v$, the black hole spin $a$, the asymptotic Mach number ${\mathcal{M}}_{\infty }$ and adiabatic index $\Gamma$. We show that the flow accretion reaches a fairly stationary regime, unlike in the Newtonian case, where significant fluctuations of the mass and angular momentum accretion rates are found. On the other hand, we consider a special case where both density and velocity gradients of the fluid are taken into account. The spin of the black hole and the asymptotic Newtonian Mach number, for this case, are $a=0.98$ and ${\mathcal{M}}_{\infty }=1$, respectively. A kind of flip-flop behavior is found at the early times; nevertheless, the system also reaches a steady state.

11 pages, 20 figures, 1 table. Accepted for publication in MNRAS

References in corpus (5)

• Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
• The Event Horizon Telescope: exploring strong gravity and accretion physics
• Is the flip-flop behaviour of accretion shock cones on to black holes an effect of coordinates?
• Axisymmetric Bondi-Hoyle accretion onto a Schwarzschild Black Hole: shock cone vibrations
• Quasi-normal acoustic oscillations in the Michel flow

Cited by in corpus (14)

• Dynamical Evolution of the Shock Cone around $4D$ Einstein-Gauss Bonnet Rotating Black Hole
• Bondi-Hoyle Accretion around the Non-rotating Black Hole in 4D Einstein-Gauss-Bonnet Gravity
• Common-envelope Dynamics of a Stellar-mass Black Hole: General Relativistic Simulations
• Relativistic wind accretion on to a Schwarzschild black hole
• Bondi-Hoyle-Lyttleton accretion in the presence of small rigid bodies around a black hole
• GW190521 formation scenarios via relativistic accretion
• Bondi-Hoyle-Lyttleton accretion onto a rotating black hole with ultralight scalar hair
• General relativistic magnetized Bondi-Hoyle-Lyttleton accretion with a spin-field misalignment: Jet nutation, polarity reversals, and Magnus drag
• Ideal Magnetohydrodynamics with Radiative Terms: Energy Conditions
• On the linear and non linear evolution of the RMHD Kelvin Helmholtz instability in a magnetically polarized fluid
• Neutron and quark stars: constraining the parameters for simple EoS using the GW170817
• Numerical general relativistic MHD with magnetically polarized matter
• Effect of matter geometry on low angular momentum black hole accretion in the Kerr metric
• Accretion of Supersonic Winds on Boson Stars