黑洞事件视界附近磁制动吸积流的圆偏振图像解析
Unraveling circular polarimetric images of magnetically arrested accretion flows near event horizon of a black hole
摘要：
磁吸积流被认为是某些超大质量黑洞的燃料，并为它们的相对论喷流提供动力。我们计算和研究的线性和圆偏振图像的数值，高分辨率和长时间模拟的磁主导流的时间序列，调查观测签名的强磁场附近的非旋转黑洞的事件视界。我们发现，分辨线极化和圆极化的大小对吸积流中电子和离子耦合的假设相当敏感。具有较冷电子的模型具有更高的法拉第旋转和转换深度，这导致扰乱的线偏振和增强的圆偏振。在这些高法拉第厚度的情况下，圆极化是特别敏感的动态的环径向磁场的吸积流。具有高法拉第厚度的模型的特点是圆偏振的旋向接近恒定，这与一些吸积黑洞的观测结果一致。我们还发现，所产生的发射区的光是透镜周围的黑洞显示反转的圆偏振旋向相对于旋向的圆偏振的整个发射区。这种极性反转是近视界发射所特有的。
英文摘要：
Magnetically arrested accretion flows are thought to fuel some of the supermassive black holes and to power their relativistic jets. We calculate and study a time sequence of linear and circular polarimetric images of numerical, high resolution and long duration simulations of magnetically dominated flows to investigate observational signatures of strong magnetic fields near the event horizon of a non-rotating black hole. We find that the magnitude of resolved linear and circular polarizations is rather sensitive to the assumption of the coupling of electron and ions in the accretion flow. Models with cooler electrons have higher Faraday rotation and conversion depths which results in scrambled linear polarization and enhanced circular polarization. In those high Faraday thickness cases the circular polarization is particularly sensitive to dynamics of toroidal-radial magnetic fields in the accretion flows. The models with high Faraday thickness are characterized by nearly constant handedness of circular polarization, consistent with observations of some accreting black holes. We also find that the emission region produced by light which is lensed around the black hole shows inversion of circular polarization handedness with respect to the handedness of the circular polarization of the entire emission region. Such polarity inversions are unique to near horizon emission.
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