研究目的
Investigating the effects of anisotropic pressure and magnetic field strength on the properties of outflow in hot accretion flows around black holes.
研究成果
The work done by anisotropic pressure heats the accretion flow and increases gas temperature, leading to stronger outflows. The energy flux of outflow can be significantly enhanced by anisotropic pressure, especially in the presence of a relatively strong magnetic field. This suggests that outflow feedback effects in active galactic nuclei can be more pronounced when anisotropic pressure is considered.
研究不足
The study assumes the magnetic field only has a toroidal component, which may not fully capture the complexity of real accretion flows. The self-similar approach cannot be applied to the region in the vicinity of the black hole, and numerical errors arise near the rotational axis.
1：Experimental Design and Method Selection:
The study uses a two-dimensional magnetohydrodynamic (MHD) model in spherical coordinates, assuming radially self-similar accretion flows. An anisotropic viscosity is employed to model the anisotropic pressure.
2：Sample Selection and Data Sources:
The study focuses on systems with extremely low accretion rates, such as Galactic Center Sgr A* and M87 galaxy.
3：List of Experimental Equipment and Materials:
The study is theoretical and computational, utilizing numerical methods to solve the MHD equations.
4：Experimental Procedures and Operational Workflow:
The equations are solved numerically using the second-order Runge–Kutta method, with boundary conditions set at the equatorial plane.
5：Data Analysis Methods:
The analysis involves examining the angular profiles of velocities, density, pressure, and temperature, as well as the Bernoulli parameter and energy fluxes carried by outflow.
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