The C-Band All Sky Survey: Diffuse Galactic Emission and CMB Polarization

c波段全天空巡天（C-BASS）是一项对全天空的5 GHz无线电巡天，对总强度和线性偏振敏感，仪器系统的干扰最小。调查的北部将使用一个新的低温接收器，在欧文斯谷射电天文台的6.1米天线上，对总强度和线性极化都进行了优化。一个平行的南部调查将在南非使用7.6米天线上的相同接收器进行。C-BASS将是对漫射星系发射的第一次调查，其频率低到足以由同步辐射主导，但高到足以不受法拉第旋转效应的影响。它将提供有关银河系星际介质、磁场和辐射机制的新信息。C-BASS在宇宙微波背景辐射（CMB）极化研究中具有重要价值。在这些研究中，C-BASS将显著提高前景减法的准确性。更广泛的影响包括公开发布数据，培训学生使用仪器，以及向来自不同年龄组和文化背景的受众进行宣传。

The C-Band All Sky Survey (C-BASS) is a radio survey at 5 GHz of the entire sky sensitive to total intensity and linear polarization, with minimal corruption by instrumental systematics. The northern part of the survey will use a new cryogenic receiver, optimized for both total intensity and linear polarization, on a 6.1-meter antenna at the Owens Valley Radio Observatory. A parallel southern survey will be conducted using an identical receiver on a 7.6-meter antenna in South Africa. The C-BASS will be the first survey of diffuse Galactic emission at a frequency low enough to be dominated by synchrotron radiation but high enough to be uncorrupted by Faraday rotation effects. It will provide new information about the Galactic interstellar medium, magnetic field, and radiation mechanisms. The C-BASS will be of great value in studies of the polarization of the cosmic microwave background radiation (CMB). C-BASS will significantly improve the accuracy of foreground subtraction in these studies.Broader impacts include public release of the data, training of students in instrumentation, and outreach to audiences from a variety of age groups and cultural backgrounds.