LOFAR and APERTIF Surveys of the Radio Sky: Probing Shocks and Magnetic Fields in Galaxy Clusters
LOFAR and APERTIF Surveys of the Radio Sky: Probing Shocks and Magnetic Fields in Galaxy Clusters
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DOI：
10.1007/s12036-011-9129-x
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发表时间：
2011-07
影响因子：
1.1
通讯作者：
H. Röttgering;J. Afonso;P. Barthel;F. Batejat;P. Best;A. Bonafede;M. Brüggen;G. Brunetti;
中科院分区：
文献类型：
--
作者：
H. Röttgering;J. Afonso;P. Barthel;F. Batejat;P. Best;A. Bonafede;M. Brüggen;G. Brunetti;
在非常低的频率上，新的泛欧射电望远镜LOFAR正在为天体物理学研究打开电磁频谱的最后一个未探索的窗口。即将安装在韦斯特博克射电望远镜（WSRT）上的革命性APERTIF相控阵将大大提高WSRT的测量速度。这两个设施的联合调查将在近20年的时间里，以1500兆赫至1400兆赫的无线电频率深入绘制北方天空。在这里，我们简要地描述了这些新设施的一些能力，以及计划进行哪些射电观测来研究与星系和星系团的形成和演化有关的基本问题。在第二部分中，我们简要回顾了最近的一些观测结果直接表明，在集群中的弥漫性无线电发射的痕迹冲击，由于集群合并。由于这些弥散射电源在低频时相对明亮，LOFAR应该能够探测到数千个这样的源，直到星团形成的时期。这将允许解决许多问题的起源和演化的冲击和磁场的集群。最后，我们简要回顾了一些第一和非常初步的LOFAR结果集群。
At very low frequencies, the new pan-European radio telescope LOFAR is opening the last unexplored window of the electromagnetic spectrum for astrophysical studies. The revolutionary APERTIF- phased arrays that are about to be installed on the Westerbork radio telescope (WSRT) will dramatically increase the survey speed for the WSRT. Combined surveys with these two facilities will deeply chart the northern sky over almost two decades in radio frequency from ∼15 up to 1400 MHz. Here we briefly describe some of the capabilities of these new facilities and what radio surveys are planned to study fun-damental issues related to the formation and evolution of galaxies and clusters of galaxies. In the second part we briefly review some recent observational results directly showing that diffuse radio emission in clusters traces shocks due to cluster mergers. As these diffuse radio sources are relatively bright at low frequencies, LOFAR should be able to detect thousands of such sources up to the epoch of cluster formation. This will allow addressing many question about the origin and evolution of shocks and magnetic fields in clusters. At the end we briefly review some of the first and very preliminary LOFAR results on clusters.