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arXiv 1302.0889astro-ph.IM
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宇宙磁性的LOFAR观点

The LOFAR View of Cosmic Magnetism

Rainer Beck, James Anderson, George Heald, Andreas Horneffer, Marco Iacobelli, Jana Koehler, David Mulcahy, Roberto Pizzo, Anna Scaife, Olaf Wucknitz, the team … 展开作者

Rainer Beck, James Anderson, George Heald, Andreas Horneffer, Marco Iacobelli, Jana Koehler, David Mulcahy, Roberto Pizzo, Anna Scaife, Olaf Wucknitz, the team of the LOFAR Magnetism Key Science Project

摘要:

宇宙中磁场的起源是天体物理学和基础物理学中的一个悬而未决的问题。利用即将到来的大型射电望远镜进行的偏振观测将开启观测磁场的新纪元,并应有助于了解磁场的起源。在低频率下,LOFAR(10-240 MHz)将使我们能够通过同步辐射绘制星系外部区域和晕圈、星系团和银河系中弱磁场的结构。在法拉第旋转测量的帮助下,甚至可以在低频下测量更弱的磁场。我们将通过对恒星的法拉第旋转测量,得到银河系局部磁场的详细图像。利用LOFAR首次获得了蟹状星云脉冲风星云、旋涡星系M51、射电星系M87和星系团A2255和A2256的有希望的图像。利用旋度合成的偏振测量技术,在银河系中观测到磁泡的漫偏振辐射。到目前为止,已经测量了20多颗恒星的偏振发射和旋转测量。

英文摘要:

The origin of magnetic fields in the Universe is an open problem in astrophysics and fundamental physics. Polarization observations with the forthcoming large radio telescopes will open a new era in the observation of magnetic fields and should help to understand their origin. At low frequencies, LOFAR (10-240 MHz) will allow us to map the structure of weak magnetic fields in the outer regions and halos of galaxies, in galaxy clusters and in the Milky Way via their synchrotron emission. Even weaker magnetic fields can be measured at low frequencies with help of Faraday rotation measures. A detailed view of the magnetic fields in the local Milky Way will be derived by Faraday rotation measures from pulsars. First promising images with LOFAR have been obtained for the Crab pulsar-wind nebula, the spiral galaxy M51, the radio galaxy M87 and the galaxy clusters A2255 and A2256. With help of the polarimetric technique of "Rotation Measure Synthesis", diffuse polarized emission has been detected from a magnetic bubble in the local Milky Way. Polarized emission and rotation measures were measured for more than 20 pulsars so far.

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。

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