MHD吸积盘上两种能量转移机制的比较

MHD张力在黑洞吸积盘模型的角动量转移上扮演重要的角色,大尺度上的MHD力矩促进吸积盘垂直向的角动量转移,并出现与吸积相关的各种流的普遍现象,而且能够影响吸积盘的辐射谱。在标准吸积盘辐射模型的基础上,考虑坡印廷流主导（Poynting-fluxdominated）和物质流主导（Mass—fluxdominated）（质量吸积率随吸积盘的半径而变化）,对吸积盘辐射产生的变化。理论表明两种主导因素对标准吸积盘的辐射能够产生很好的修正。同时两种主导模型之间也存在着一定的差别。坡印廷流主导的盘产生的辐射峰值频率比物质流主导的要高。物质流主导的吸积盘产生的辐射谱型在低频部分要比坡印廷流主导的要平坦。

The Comparison of Two Kinds of Energy Transfer Mechanism on MHD Accretion Disk

MHD stresses play an important role in the angular momentum transfer of black hole ac- cretion disk model. Large--scale MHD torques promote the vertical angular momentum tranfer of ac- cretion disks,and associated with the accretion of the various outflow phenomenon. Furthermore, it can affect the radiation spectrum of accretion disks. On the basis of standard radiation accretion disk model,we compared radiation changes of poynting--flux dominated accretion disk and Mass flux dominated accretion disk. Theory suggests that two main factors on the standard of accretion disks radiation can produce very good correction. At the same time between the two dominant model also exist difference. Poynting flux dominated accretion produce radiation is higher than Mass flux dominated in the high frequency part. Radiation spectrum of Mass flux dominated accretion disk is flat than Povnting flux in the low frequency Dart.