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Faraday Synthesis and Magnetic Field Statistics

法拉第合成和磁场统计

基本信息

批准号：
159481090
负责人：
Privatdozent Dr. Torsten Enßlin
金额：
--
依托单位：
Max-Planck-Institut für Astrophysik (MPA)
依托单位国家：
德国
项目类别：
Research Units
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/159481090?language=en
关键词：
Faraday Synthesis Magnetic Field Statistics

项目摘要

Magnetic structures in the interstellar and intergalactic medium imprint characteristic signatures onto polarised synchrotron radiation. Two processes are relevant here, the emission process, which depends on the strength and orientation of the magnetic field, and the Faraday rotation, which is determined by the magnetic line-of-sight component. Both permit deductions on the three dimensional structure of magnetic fields. As planned, we have developed during the first funding period methods to extract from radio observations information on cosmic magnetism. These should be extended and applied to data sets of the research unit. On the one hand, there is our novel Faraday synthesis, the unification of RM and aperture synthesis. This delivers high fidelity three dimensional images of cosmic magnetic fields. On the other hand, we have developed methods for the statistical characterization of magnetic fields to measure magnetic helicity or to indicate magnetic reversals with respect to the line-of-sight, the latter via the Faraday caustics that we have predicted. We strive now for a unification of the statistical analysis and the imaging algorithms. A special Faraday synthesis method should be developed for the Faraday caustics. Furthermore, we want to develop and apply novel methods to map out galactic and extragalactic magnetic fields via Faraday rotation data.

星际和星系间介质中的磁性结构在偏振同步辐射上留下了特征性的印记。这里有两个相关的过程，发射过程，它取决于磁场的强度和方向，以及法拉第旋转，这是由磁视线分量决定的。这两种理论都能推导出磁场的三维结构。按照计划，我们在第一个资助期内开发了从无线电观测中提取宇宙磁性信息的方法。这些数据应加以扩展，并应用于研究单位的数据集。一方面，我们有新的法拉第合成，RM和孔径合成的统一。这提供了宇宙磁场的高保真三维图像。另一方面，我们已经开发了方法的统计特性的磁场来测量磁螺旋或指示磁反转相对于视线，后者通过法拉第焦散线，我们已经预测。我们现在争取统一的统计分析和成像算法。对于法拉第焦散线，应发展一种特殊的法拉第综合方法。此外，我们希望开发和应用新的方法，通过法拉第旋转数据来绘制银河系和河外磁场。