In our study, we examine a 2D radiation, relativistic, magnetohydrodynamics accretion flow around a spinning supermassive black hole. We begin by setting an initial equilibrium torus around the black hole, with an embedded initial magnetic field inside the torus. The strength of the initial magnetic field is determined by the plasma beta parameter, which is the ratio of the gas pressure to the magnetic pressure. In this paper, we perform a comparative study of the magnetically arrested disc (MAD) and standard and normal evolution (SANE) states. We observe that the MAD state is possible for comparatively high initial magnetic field strength flow. Additionally, we also adopt a self-consistent two-temperature model to evaluate the luminosity and energy spectrum for our model. We observe that the total luminosity is mostly dominated by bremsstrahlung luminosity compared to the synchrotron luminosity due to the presence of a highly dense torus. We also identify similar quasi-periodic oscillations for both MAD and SANE states based on power-density spectrum analysis. Furthermore, our comparative study of the energy spectrum does not reveal any characteristic differences between MAD and SANE states. Last, we note that the MAD state is possible for both prograde and retrograde accretion flow.

中文翻译：

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旋转 AGN 周围的辐射 RMHD 吸积流：MAD 和 SANE 状态的比较研究


在我们的研究中，我们研究了旋转超大质量黑洞周围的二维辐射、相对论、磁流体动力学吸积流。我们首先在黑洞周围设置一个初始平衡环面，并在环面内嵌入初始磁场。初始磁场的强度由等离子体β参数决定，该参数是气体压力与磁压力的比值。在本文中，我们对磁滞盘（MAD）和标准和正常演化（SANE）状态进行了比较研究。我们观察到，对于相对较高的初始磁场强度流，MAD 状态是可能的。此外，我们还采用自洽的双温度模型来评估我们模型的光度和能谱。我们观察到，由于存在高密度环面，与同步加速器光度相比，总光度主要由轫致辐射光度主导。我们还根据功率密度谱分析确定了 MAD 和 SANE 状态的类似准周期振荡。此外，我们对能谱的比较研究没有揭示 MAD 和 SANE 状态之间的任何特征差异。最后，我们注意到 MAD 状态对于顺行和逆行吸积流都是可能的。