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

C波段全天探测(C-BASS)是对整个天空进行的5千兆赫无线电探测，对总强度和线偏振很敏感，仪器系统学造成的干扰最小。调查的北部将在欧文斯山谷射电天文台6.1米长的天线上使用一种新的低温接收器，该接收器针对总强度和线极化进行了优化。在南非，将在7.6米长的天线上使用相同的接收器进行平行的南方调查。C-BASS将是对银河系漫射辐射的第一次探测，其频率低到足以被同步辐射所主导，但高到足以不受法拉第自转效应的影响。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)的偏振研究中具有重要的应用价值。C-BASS将显著提高这些研究中前景减法的准确性。广泛的影响包括数据的公开发布，对学生的乐器培训，以及接触不同年龄段和文化背景的观众。

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.