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arXiv 1408.4032astro-ph.HEastro-ph.GA
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同步辐射通过压缩随机磁场的辐射转移

The radiative transfer of synchrotron radiation through a compressed random magnetic field

T. V. Cawthorne, P. A. Hughes

摘要:

本文研究了由高度无序的磁场压缩产生的磁场位形中同步辐射的辐射转移。结果表明,法拉第旋转和圆偏振可以忽略不计,辐射转移方程同步辐射分离为这种配置,和强度和偏振值的来源是均匀的大尺度上可以直接发现的情况下,不透明度是显着的。虽然发射和吸收系数通常必须通过数值计算获得,但该过程比传输方程的完全数值解简单得多。给出了一些说明性的结果和一个有趣的效果,即极化增加,而磁场分布变得不那么强烈地局限于压缩平面,进行了讨论。这些结果对于解释射电星系中瓣边缘附近的偏振和活动星系核的秒差距尺度喷流中的明亮特征具有重要意义,因为人们认为这种磁场配置是存在的。(Note:本文的原始ApJ版本包含两个勘误表,在本文的此版本中进行了更正。首先,图2被绘制为关于线$\log_{10}(ν/ ν_0)=0$反射的正确版本的镜像。第二,如所述,公式A16对$γ=2$有效,而对$γ=3$无效。)

英文摘要:

This paper examines the radiative transfer of synchrotron radiation in the presence of a magnetic field configuration resulting from the compression of a highly disordered magnetic field. It is shown that, provided Faraday rotation and circular polarization can be neglected, the radiative transfer equations for synchrotron radiation separate for this configuration, and the intensities and polarization values for sources that are uniform on large scales can be found straightforwardly in the case where opacity is significant. Although the emission and absorption coefficients must, in general, be obtained numerically, the process is much simpler than a full numerical solution to the transfer equations. Some illustrative results are given and an interesting effect, whereby the polarization increases while the magnetic field distribution becomes less strongly confined to the plane of compression, is discussed. The results are of importance for the interpretation of polarization near the edges of lobes in radio galaxies and of bright features in the parsec--scale jets of AGN, where such magnetic field configurations are believed to exist. (Note: The original ApJ version of this paper contained two errata, which are corrected in this version of the paper. First, Fig. 2 was plotted as a mirror image of the correct version, reflected about the line $\log_{10}(ν/ ν_0)=0$. Second, as stated, Equation A16 is valid for $γ=2$, not $γ=3$.)

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