旋转测量天空中的结构
Structure in the Rotation Measure Sky
摘要：
基于Taylor等人（2009）的旋转测度（RM）星表，分析了整个天空的旋转测度结构。几个解决RM结构被确定为结构在本地ISM，包括无线电环路I，II和III，胶星云，猎户座-波江座超级气泡。给出了选定区域的RM结构函数，并将天空中的SF振幅和斜率图与H-α强度和漫射偏振强度图进行了比较。在1度角尺度上的RM方差与通过银河系的视线长度相关，并有来自局部结构的贡献。SFs的斜率不太集中于银河平面，与通过银河系的视线长度相关性较小，这表明RM结构在角尺度上的起源更接近于10度。RM的方差是一个因素~2对SGP比对NGP高，反映了更广泛的不对称性之间的南北银河半球。在纬度< 30度的银河系扩散同步辐射的退偏振可以很大程度上用与RM的小尺度变化相关的法拉第色散来解释，但是误差允许来自沿视线的差分法拉第旋转的显著贡献。
英文摘要：
An analysis of structure in rotation measure (RM) across the sky based on the RM catalog of Taylor et al. (2009) is presented. Several resolved RM structures are identified with structure in the local ISM, including radio loops I, II, and III, the Gum nebula, and the Orion-Eridanus super bubble. Structure functions (SFs) of RM are presented for selected areas, and maps of SF amplitude and slope across the sky are compared with H-alpha intensity and diffuse polarized intensity. RM variance on an angular scale of 1 degree is correlated with length of the line of sight through the Galaxy, with a contribution from local structures. The slope of the SFs is less concentrated to the Galactic plane and less correlated with length of the line of sight through the Galaxy, suggesting a more local origin for RM structure on angular scales ~ 10 degrees. The RM variance is a factor ~2 higher towards the SGP than towards the NGP, reflecting a more wide-spread asymmetry between the northern and southern Galactic hemispheres. Depolarization of diffuse Galactic synchrotron emission at latitudes < 30 degrees can be explained largely by Faraday dispersion related to small-scale variance in RM, but the errors allow a significant contribution from differential Faraday rotation along the line of sight.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
