The LOFAR view of cosmic magnetism
The LOFAR view of cosmic magnetism
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DOI：
10.1002/asna.201311894
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发表时间：
2013-02
影响因子：
0.9
通讯作者：
R. Beck;James M. Anderson;G. Heald;A. Horneffer;M. Iacobelli;J. Koehler;D. Mulcahy;R. Pizzo;A. Scaife;O. Wucknitz;the team of the Lofar Magnetism Key Science Project-the-team-of-the-Lofar-Magnetism-Key-Science-Project-123206934
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文献类型：
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作者：
R. Beck;James M. Anderson;G. Heald;A. Horneffer;M. Iacobelli;J. Koehler;D. Mulcahy;R. Pizzo;A. Scaife;O. Wucknitz;the team of the Lofar Magnetism Key Science Project-the-team-of-the-Lofar-Magnetism-Key-Science-Project-123206934
宇宙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磁场观测的新纪元，并应有助于了解磁场的起源。在低频率下，LOFAR（10 - 240 MHz）将允许我们通过它们的同步辐射来绘制星系团和银河系外部区域和晕中弱磁场的结构。借助法拉第旋转测量，在低频下可以测量更弱的磁场。通过对双极星的法拉第旋转测量，我们可以得到局部密勒基磁场的详细视图。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。
The origin of magnetic fields in the Universe is an open proble m 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 galax ies, in galaxy clusters and in the Milky Way via their synchrotron emission. Even weaker magnetic fields can be mea sured at low frequencies with help of Faraday rotation measures. A detailed view of the magnetic fields in the local M ilky 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 M 51, the radio galaxy M 87 and the galaxy clusters A 2255 and A 2256. 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.