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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Viscous Accreting Magnetofluids around a Static Compact Objectin Final Stages of Accretion Flow
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Viscous Accreting Magnetofluids around a Static Compact Objectin Final Stages of Accretion Flow

机译：在吸积流的最终阶段，静态紧凑物体周围的粘性吸积磁流体

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摘要

The dynamics of the stationary axisymmetric configuration of accreting magnetofluids surrounding a non-rotating compact object in the final stages of accretion flow is presented here. We discuss two classes of solutions forthe angular momentum: a Keplerian solution, which demands no accretion flow for the fluids, and a non-Kepleriansolution, which requires a radial inflow velocity for the matter. For the special case of no presence of electromagneticfields, two sets of self-consistent analytical solutions of fully relativistic fluid equations are obtained separately fortwo different equations of state. The effect of the bulk viscosity coefficient on the physical functions was investi-gated for each state, as well as the bounds that exert on the free parameters due to last stages of the accretion-flowcondition. To resolve the magnetohydrodynamical equations, we were inspired by previous sets of solutions, sincethe magnetofluid equations are just the same as the fluid ones in the case of vanishing electromagnetic fields. Theazimuthal current in magnetofluids doesn't modify the dipolar configuration of the central object magnetic field,owing to the lack of a finite resistivity. The presence of this magnetic field doesn't affect the azimuthal velocity ofthe plasma, but does slow down its radial inflow, and decrease the density and pressure of the plasma. Despite therole importance of the bulk viscosity on the fluids' dynamics in the absence of electromagnetic fields, exerting themagnetic field decreases this role.
机译：此处介绍了在吸积流的最后阶段，围绕非旋转的紧凑物体的吸积磁流体的静态轴对称配置的动力学。我们讨论了角动量的两类解决方案：开普勒斯解（不需要流体的积聚流）和非开普勒斯解决方案（不需要物质的径向流入速度）。对于不存在电磁场的特殊情况，针对两个不同的状态方程，分别获得了两组完全相对论的流体方程的自洽解析解。研究了每种状态下的本体粘度系数对物理功能的影响，以及由于积聚-流动条件的最后阶段而对自由参数施加的界限。为了解决磁流体动力学方程，我们受到了先前解决方案的启发，因为在电磁场消失的情况下，磁流体方程与流体方程完全相同。由于缺乏有限的电阻率，磁流体中的方位角电流不会改变中心物体磁场的偶极结构。该磁场的存在不会影响等离子体的方位角速度，但会减慢其径向流入，并降低等离子体的密度和压力。尽管在没有电磁场的情况下本体粘度对流体动力学的作用很重要，但施加磁场会降低这种作用。

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