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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS April Meeting 2017 - Event - The Cosmology Large Angular Scale Surveyor (CLASS): instrument and survey status
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APS -APS April Meeting 2017 - Event - The Cosmology Large Angular Scale Surveyor (CLASS): instrument and survey status

机译:APS -APS 2017年4月会议-活动-宇宙学大角度测量器(CLASS):仪器和测量状态

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The Cosmology Large Angular Scale Surveyor (CLASS) is an array of four telescopes that observes the polarization of the cosmic microwave background from the Atacama Desert in Chile. From this site, CLASS surveys 70% of the sky at four frequency bands centered at 38, 93, 148, and 217 GHz respectively. By targeting the polarized signal on the largest scales, CLASS uniquely aims to characterize the E and B-mode power spectra on both the reionization and recombination scales. Simulations, including systematics and foregrounds, have shown the CLASS strategy of combining large sky coverage, front-end polarization modulation, and high sensitivity enables characterization of inflationary gravitational waves at all relevant angular scales to the r=0.01 level, measurements of the optical depth to reionization to the cosmic-variance-limit, and improved constraints on the mass of neutrinos. The first telescope of the CLASS array, observing at 38 GHz, achieved first light in May 2016. Here I review the objectives, strategy and architecture of the CLASS experiment and give an update on the survey.
机译:宇宙学大角尺测量仪(CLASS)是由四个望远镜组成的阵列,用于观测智利阿塔卡马沙漠中宇宙微波背景的极化。 CLASS在此站点上分别在以38、93、148和217 GHz为中心的四个频段上调查了70%的天空。通过在最大尺度上瞄准极化信号,CLASS的独特目的是在电离和重组尺度上表征E和B模式功率谱。包括系统和前景在内的仿真结果表明,CLASS策略结合了广阔的天空覆盖范围,前端偏振调制和高灵敏度,可表征所有相关角度范围至r = 0.01的膨胀重力波,并测量光学深度电离到宇宙方差极限,并改善了对中微子质量的约束。 CLASS阵列的第一台望远镜在38 GHz处观测,于2016年5月射出第一束光。在这里,我回顾了CLASS实验的目标,策略和体系结构,并对调查进行了更新。

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