用500米口径球面望远镜绘制21厘米强度图
21 cm intensity mapping with the Five hundred metre Aperture Spherical Telescope
摘要：
本文介绍了一个利用500米口径球面望远镜（FAST）绘制$0.5 < z < 2.5$范围内21厘米（红移）天空强度图的尽可能大尺度宇宙结构图的方案。目标是通过一组横向光束的简单漂移扫描，将一大片天空映射到FAST的角度和光谱分辨率。这一方法将补充星系调查，并可在平方公里阵列（SKA）开始更详细和精确的工作之前完成。这一科学将测量大尺度结构上的大小和更大尺度的重子声学振荡，其结果将对其同时代的观测起到补充作用并具有重要意义。这项调查将对大统一理论尺度下暴胀可能产生的超大尺度特征具有独特的敏感性，并将对宇宙微波背景的观测起到补充作用。
英文摘要：
This paper describes a programme to map large-scale cosmic structures on the largest possible scales by using the Five hundred metre Aperture Spherical Telescope (FAST) to make a 21 cm (red-shifted) intensity map of the sky for the range $0.5 < z < 2.5$. The goal is to map to the angular and spectral resolution of FAST a large swath of the sky by simple drift scans with a transverse set of beams. This approach would be complementary to galaxy surveys and could be completed before the Square Kilometre Array (SKA) could begin a more detailed and precise effort. The science would be to measure the large-scale structure on the size of the baryon acoustic oscillations and larger scale, and the results would be complementary to its contemporary observations and significant. The survey would be uniquely sensitive to the potential very large-scale features from inflation at the Grand Unified Theory (GUT) scale and complementary to observations of the cosmic microwave background.
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