MAGNETIC VISIONS: MAPPING COSMIC MAGNETISM WITH LOFAR AND SKA
MAGNETIC VISIONS: MAPPING COSMIC MAGNETISM WITH LOFAR AND SKA
复制标题
磁力愿景：用 LOFAR 和 SKA 绘制宇宙磁力图
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
R. Beck
中科院分区：
文献类型：
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作者：
R. Beck
宇宙中磁场的起源是天体物理学和基础物理学的一个开放性问题。“宇宙磁学”已被接受为低频阵列（LOFAR，正在建设中）和计划中的平方公里阵列（SKA）的重点科学项目。在低频率下，LOFAR和SKA将允许绘制星系外围区域和星系晕、星系团和银河系中弱磁场的结构。用SKA在高频率下的高分辨率极化观测将以前所未有的细节追踪星系盘和中心区域的磁场。面向极化背景源的法拉第旋转测量（RM）全天巡天将用于模拟银河系、星系的星际介质和星系间介质中磁场的结构和强度。应用于光谱偏振数据立方体的“RM合成”新方法将分离不同距离的RM组件，并允许3-D“法拉第断层成像”。遥远星系和星系团以及星系间细丝中的磁场将通过弱同步加速器发射和背景源RM的深度成像来搜索。这将开启宇宙磁场观测的新时代。
The origin of magnetic fields in the Universe is an open problem in astrophysics and fundamental physics. “Cosmic Magnetism” has been accepted as Key Science Project both for the Low Frequency Array (LOFAR, under construction) and the planned Square Kilometre Array (SKA). At low frequencies LOFAR and SKA will allow to map the structure of weak magnetic fields in the outer regions and halos of galaxies, in galaxy clusters and in the Milky Way. High-resolution polarization observations at high frequencies with the SKA will trace magnetic fields in the disks and central regions of galaxies in unprecedented detail. All-sky surveys of Faraday rotation measures (RM) towards polarized background sources will be used to model the structure and strength of the magnetic fields in the Milky Way, the interstellar medium of galaxies and the intergalactic medium. The new method of “RM Synthesis”, applied to spectro-polarimetric data cubes, will separate RM components from different distances and allow 3-D “Faraday tomography”. Magnetic fields in distant galaxies and clusters and in intergalactic filaments will be searched for by deep imaging of weak synchrotron emission and of RM towards background sources. This will open a new era in the observation of cosmic magnetic fields.