Hot Accretion Flow in Two-Dimensional Spherical Coordinates: Considering Pressure Anisotropy and Magnetic Field

Deng, Hui-Hong; Bu, De-Fu

doi:10.3390/universe5090197

Cited by 3 publications

(1 citation statement)

References 92 publications

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“…There are several analytical investigations based on the self-similar assumption that probe the magnetic field effects in hot accretion flows (Akizuki & Fukue 2006;Abbassi et al 2008;Zhang & Dai 2008;Bu et al 2009;Mosallanezhad et al 2014;Samadi et al 2017;Bu & Mosallanezhad 2018;Deng & Bu 2019). In practice, the analytical studies are powerful tools to understand the physical properties of inflow and wind from accretion flow.…”

Section: Introductionmentioning

confidence: 99%

Self-similar Solution of Hot Accretion Flow with Thermal Conduction and Anisotropic Pressure

Mosallanezhad,

Zeraatgari,

Mei

et al. 2022

Preprint

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We explore the effects of anisotropic thermal conduction, anisotropic pressure, and magnetic field strength on the hot accretion flows around black holes by solving the axisymmetric, steady-state magnetohydrodynamic equations. The anisotropic pressure is known as a mechanism for transporting angular momentum in weakly collisional plasmas in hot accretion flows with extremely low mass accretion rates. However, anisotropic pressure does not extensively impact the transport of the angular momentum, it leads to shrinkage of the wind region. Our results show that the strength of the magnetic field can help the Poynting energy flux overcomes the kinetic energy flux. This result may be applicable to understand the hot accretion flow in the Galactic Center Sgr A* and M87 galaxy.

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Section: Introductionmentioning

confidence: 99%

Self-similar Solution of Hot Accretion Flow with Thermal Conduction and Anisotropic Pressure

Mosallanezhad,

Zeraatgari,

Mei

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

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The role of resistivity in hot accretion flows with anisotropic pressure: Comparing magnetic field models

Ghoreyshi

Khesali

2022

Publications of the Astronomical Society of Japan

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In hot accretion flows, such as the accretion flow in the Galactic center (Sgr A*) and in M 87, the collisional mean free path of the charged particles is significantly larger than the typical length-scale of the accretion flows. Under these conditions, the pressure perpendicular to the magnetic field and that parallel to the magnetic field are not the same; therefore, the pressure is anisotropic to magnetic field lines. On the other hand, the resistivity as a dissipative mechanism plays a key role in the structure and the heating of hot accretion flows. In the present paper, we study the dynamics of resistive hot accretion flows with anisotropic pressure when the magnetic fields have even z-symmetry about the midplane. By presenting a set of self-similar solutions, we find that if the magnetic fields have even z-symmetry or the viscosity form depends on the strength of magnetic field, the disc properties can be entirely different. In the presence of symmetric fields, the velocity components and the disc temperature increase considerably. Also, we show that the increase in infall velocity and temperature due to the anisotropic pressure can be more significant if the resistivity is taken into account. Our results indicate that the resistivity can be an effective mechanism for the heating of hot accretion flows in the high-limit of the magnetic diffusivity parameter. Moreover, the heating due to the anisotropic pressure is comparable to the resistive heating, only when the strength of anisotropic pressure is about unity. The increase of disc temperature can lead to the acceleration of the electrons in such flows. This helps us to explain the origin of phenomena such as the flares in Sgr A*. Our results predict that the presence of resistivity makes it easier for outflows to launch from hot accretion flows.

show abstract

Self-similar Solution of Hot Accretion Flow with Thermal Conduction and Anisotropic Pressure

Mosallanezhad

Zeraatgari

Mei

et al. 2022

ApJ

View full text Add to dashboard Cite

We explore the effects of anisotropic thermal conduction, anisotropic pressure, and magnetic field strength on the hot accretion flows around black holes by solving the axisymmetric, steady-state magnetohydrodynamic equations. The anisotropic pressure is known as a mechanism for transporting angular momentum in weakly collisional plasmas in hot accretion flows with extremely low mass accretion rates. However, anisotropic pressure does not extensively impact the transport of the angular momentum, it leads to shrinkage of the wind region. Our results show that the strength of the magnetic field can help the Poynting energy flux overcome the kinetic energy flux. This result may be applicable to the understanding of the hot accretion flow in the Galactic Center Sgr A* and the M87 galaxy.

show abstract

Hot Accretion Flow in Two-Dimensional Spherical Coordinates: Considering Pressure Anisotropy and Magnetic Field

Cited by 3 publications

References 92 publications

Self-similar Solution of Hot Accretion Flow with Thermal Conduction and Anisotropic Pressure

Self-similar Solution of Hot Accretion Flow with Thermal Conduction and Anisotropic Pressure

The role of resistivity in hot accretion flows with anisotropic pressure: Comparing magnetic field models

Self-similar Solution of Hot Accretion Flow with Thermal Conduction and Anisotropic Pressure

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