Aitken DK, Greaves J, Chrysostomou A, Jenness T, Holland W, Hough JH, Pierce-Price D, Richer J
Astrophys J. 2000 May 10;534(2):L173-L176. doi: 10.1086/312685.
We report the detection of linear polarization from Sgr A* at 750, 850, 1350, and 2000 µm which confirms the contribution of synchrotron radiation. From the lack of polarization at longer wavelengths, it appears to arise in the millimeter/submillimeter excess. There are large position angle changes between the millimeter and submillimeter results, and these are discussed in terms of a polarized dust contribution in the submillimeter and various synchrotron models. In the model that best explains the data, the synchrotron radiation from the excess is self-absorbed in the millimeter region and becomes optically thin in the submillimeter. This implies that the excess arises in an extremely compact source of approximately 2 Schwarzschild radii.
我们报告了在750、850、1350和2000微米波长处对人马座A*线性偏振的探测，这证实了同步辐射的贡献。从较长波长处缺乏偏振来看，它似乎产生于毫米/亚毫米波段的过剩辐射中。毫米和亚毫米波段的结果之间存在较大的方位角变化，并且根据亚毫米波段中偏振尘埃的贡献以及各种同步辐射模型对这些变化进行了讨论。在最能解释数据的模型中，过剩辐射产生的同步辐射在毫米波段是自吸收的，而在亚毫米波段变为光学薄。这意味着过剩辐射产生于一个半径约为2倍史瓦西半径的极其致密的源。
