人马座A的线偏振和圆偏振辐射
Linearly and Circularly Polarized Emission in Sagittarius A*
摘要：
本文用广义相对论射线追迹方法计算了人马座A* 中偏振同步辐射通过相对论吸积流的传输。基于两温磁旋转不稳定性（MRI）诱导吸积模，自洽地处理了双折射效应。通过拟合Sgr A* 从毫米波段到近红外波段的光谱和偏振态，我们不仅可以约束与磁共振成像和电子加热速率相关的基本参数，而且可以限制吸积环的取向。这些限制导致独特的偏振图像，这可能是未来的毫米和亚毫米VLBI观测比较。结合广义相对论MHD模拟，该模型有可能测试与观测的Sgr A* 的MRI。
英文摘要：
We perform general relativistic ray-tracing calculations of the transfer of polarized synchrotron radiation through the relativistic accretion flow in Sagittarius (Sgr) A*. Based on a two-temperature magneto-rotational-instability (MRI) induced accretion mode, the birefringence effects are treated self-consistently. By fitting the spectrum and polarization of Sgr A* from millimeter to near-infrared bands, we are able to not only constrain the basic parameters related to the MRI and the electron heating rate, but also limit the orientation of the accretion torus. These constraints lead to unique polarimetric images, which may be compared with future millimeter and sub-millimeter VLBI observations. In combination with general relativistic MHD simulations, the model has the potential to test the MRI with observations of Sgr A*.
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