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arXiv 1805.04490astro-ph.IMastro-ph.CO
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C波段全天空巡天(C-BASS):设计和能力

The C-Band All-Sky Survey (C-BASS): Design and capabilities

Michael E. Jones, Angela C. Taylor, Moumita Aich, C. J. Copley, H. Cynthia Chiang, R. J. Davis, C. Dickinson, R. D. P. Grumitt, Yaser Hafez, Heiko M. Heilgendor… 展开作者

Michael E. Jones, Angela C. Taylor, Moumita Aich, C. J. Copley, H. Cynthia Chiang, R. J. Davis, C. Dickinson, R. D. P. Grumitt, Yaser Hafez, Heiko M. Heilgendorff, C. M. Holler, M. O. Irfan, Luke R. P. Jew, J. J. John, J. Jonas, O. G. King, J. P. Leahy, J. Leech, E. M. Leitch, S. J. C. Muchovej, T. J. Pearson, M. W. Peel, A. C. S. Readhead, Jonathan Sievers, M. A. Stevenson, J. Zuntz

摘要:

C波段全天巡天(C-BASS)是一种频率为5 GHz的全天全极化巡天,旨在为WMAP和普朗克的全天巡天以及未来的CMB B模式极化成像巡天提供补充数据。观测频率的选择提供了一个信号,主要是由银河系同步辐射,但很少受到法拉第旋转,使测得的偏振方向提供了一个很好的模板,为更高的频率观测,并携带直接信息的银河系磁场。在北半球和南半球的望远镜具有匹配的光学性能,用于从地面实验提供全天覆盖。每个望远镜上的连续比较辐射计和相关偏振计提供稳定的成像特性,以便从45弧分的仪器分辨率到全天空的所有角度尺度都能准确测量。北仪已完成勘测,南仪已开始观测。我们预计,C-BASS数据将显着改善普朗克和其他CMB数据的组件分离分析,并将提供重要的约束异常银河尘埃和银河磁场的属性。

英文摘要:

The C-Band All-Sky Survey (C-BASS) is an all-sky full-polarisation survey at a frequency of 5 GHz, designed to provide complementary data to the all-sky surveys of WMAP and Planck, and future CMB B-mode polarization imaging surveys. The observing frequency has been chosen to provide a signal that is dominated by Galactic synchrotron emission, but suffers little from Faraday rotation, so that the measured polarization directions provide a good template for higher frequency observations, and carry direct information about the Galactic magnetic field. Telescopes in both northern and southern hemispheres with matched optical performance are used to provide all-sky coverage from a ground-based experiment. A continuous-comparison radiometer and a correlation polarimeter on each telescope provide stable imaging properties such that all angular scales from the instrument resolution of 45 arcmin up to full sky are accurately measured. The northern instrument has completed its survey and the southern instrument has started observing. We expect that C-BASS data will significantly improve the component separation analysis of Planck and other CMB data, and will provide important constraints on the properties of anomalous Galactic dust and the Galactic magnetic field.

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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