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arXiv 1611.09720gr-qcastro-ph.HE
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黑洞吸积密码

The Black Hole Accretion Code

Oliver Porth, Hector Olivares, Yosuke Mizuno, Ziri Younsi, Luciano Rezzolla, Monika Moscibrodzka, Heino Falcke, Michael Kramer

摘要:

我们提出的黑洞吸积代码(BHAC),一个新的多维广义相对论磁流体力学模块的MPI-AMRVAC框架。BHAC的目的是解决理想的广义相对论磁流体动力学方程在任意时空,并利用自适应网格细化技术与一个有效的块为基础的方法。几个时空已经实现和测试。我们证明了BHAC的有效性,通过各种一维,二维和三维的测试问题,以及通过密切的比较与HARM 3D代码的情况下,一个环面吸积到一个黑洞。湍流吸积方案的收敛性研究与几个诊断,我们发现吸积率和视界穿透通量收敛到百分之几的问题时,在三维空间中运行。我们的分析还涉及相应的热同步辐射的研究,这是通过一个新的广义相对论辐射转移代码,BHOSS。由此产生的合成强度地图的吸积到黑洞被发现是收敛的分辨率增加,并预计将发挥至关重要的作用,在解释地平线尺度的图像所产生的无线电观测源在银河系中心。

英文摘要:

We present the black hole accretion code (BHAC), a new multidimensional general-relativistic magnetohydrodynamics module for the MPI-AMRVAC framework. BHAC has been designed to solve the equations of ideal general-relativistic magnetohydrodynamics in arbitrary spacetimes and exploits adaptive mesh refinement techniques with an efficient block-based approach. Several spacetimes have already been implemented and tested. We demonstrate the validity of BHAC by means of various one-, two-, and three-dimensional test problems, as well as through a close comparison with the HARM3D code in the case of a torus accreting onto a black hole. The convergence of a turbulent accretion scenario is investigated with several diagnostics and we find accretion rates and horizon-penetrating fluxes to be convergent to within a few percent when the problem is run in three dimensions. Our analysis also involves the study of the corresponding thermal synchrotron emission, which is performed by means of a new general-relativistic radiative transfer code, BHOSS. The resulting synthetic intensity maps of accretion onto black holes are found to be convergent with increasing resolution and are anticipated to play a crucial role in the interpretation of horizon-scale images resulting from upcoming radio observations of the source at the Galactic Center.

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