Improved Model of X-Ray Emission from Hot Accretion Flows

Improved Model of X-Ray Emission from Hot Accretion Flows
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热吸积流 X 射线发射的改进模型

DOI:
10.3847/1538-4357/ac6c8b
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发表时间:
2022-05
期刊:
ApJ
影响因子:
--
通讯作者:
Xie F. G.
Xie F. G.
中科院分区:
其他
文献类型:
--
作者:
Niedzwiecki A.;Szanecki M.;Zdziarski A. A.;Xie F. G.

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我们开发了一种改进的光学薄、双温度吸积流 X 射线发射模型,kerrflow,使用全局康普顿化的精确蒙特卡罗处理以及辐射和流体动力学过程的完全一般相对论描述。它还包括π介子衰变电子,其同步加速器发射主导超大质量黑洞周围流动中Ṁ/ṀEdd≳0.1的种子光子产量。我们详细考虑了模型光谱对黑洞自旋、电子加热效率、等离子体磁化强度和吸积率的依赖性,并通过分析附近低光度活动星系核的X射线光谱讨论了约束这些参数的可行性。我们注意到,在分析单个 X 射线光谱时,一些简并性阻碍了这些参数的精确估计。当联合拟合来自给定源的多个光谱时,这些简并性就会被消除,从而使我们能够可靠地测量模型参数。我们发现与以前的热流发射光谱模型存在显着差异,这与康普顿化的计算方法有关。最后,我们简要考虑并讨论对粘度参数和流出强度的依赖性。
We have developed an improved model of X-ray emission from optically thin, two-temperature accretion flows, kerrflow, using an exact Monte Carlo treatment of global Comptonization as well as with a fully general relativistic description of both the radiative and hydrodynamic processes. It also includes pion-decay electrons, whose synchrotron emission dominates the seed photon yield at Ṁ/ṀEdd≳0.1 in flows around supermassive black holes. We consider in detail the dependence of the model spectra on the black hole spin, the electron heating efficiency, the plasma magnetization, and the accretion rate, and we discuss the feasibility of constraining these parameters by analyzing X-ray spectra of nearby low-luminosity active galactic nuclei. We note some degeneracies that hinder precise estimations of these parameters when individual X-ray spectra are analyzed. These degeneracies are eliminated when several spectra from a given source are fitted jointly, which then allows us to reliably measure the model parameters. We find significant differences with previous spectral models of hot-flow emission, related with the computational methods for Comptonization. Finally, we briefly consider and discuss the dependence on the viscosity parameter and on the outflow strength.
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