The QMAP and MAT/TOCO Experiments for Measuring Anisotropy in the Cosmic Microwave Background
The QMAP and MAT/TOCO Experiments for Measuring Anisotropy in the Cosmic Microwave Background
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宇宙微波背景下测量各向异性的 QMAP 和 MAT/TOCO 实验
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
W. Vinje
中科院分区：
文献类型：
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作者：
A. Miller;A. Miller;J. Beach;J. Beach;S. Bradley;R. Caldwell;R. Caldwell;R. Caldwell;H. Chapman;M. Devlin;M. Devlin;W. B. Dorwart;T. Herbig;T. Herbig;D. Jones;G. Monnelly;G. Monnelly;C. Netterfield;C. Netterfield;M. Nolta;L. Page;J. Puchalla;J. Puchalla;T. Robertson;T. Robertson;E. Torbet;E. Torbet;H. Tran;W. Vinje;W. Vinje
我们描述了两个测量宇宙微波背景中各向异性的相关实验。QMAP是一个气球携带的望远镜，在1996年飞行了两次，用六个基于高电子迁移率晶体管的放大器(HEMT)阵列收集度角尺度的数据。QMAP使用联锁扫描策略，在有限的天空区域直接生成高信噪比的CMB地图。QMAP吊车随后被改装用于地面工作，作为MAT/TOCO实验。1997年和1998年在智利北部Cerro Toco的5200米高空用时间域波束合成进行了观测。MAT/TOCO测量了CMB角谱的上升和下降，从而将第一个峰的位置定位到lPeak=216±14。除了介绍仪器外，我们还讨论了数据选择方法，检查了系统误差，并将MAT/TOCO的结果与最近的实验结果进行了比较。先前报告的数据被更新以说明小的校准偏移，并被校正以说明来自已知的前景发射源的小的贡献。由此得到的第一个峰的幅度为δT_PEAK=80.9±3.4±5.1μK，其中第一个不确定度是统计的，第二个不确定度来自校准。
We describe two related experiments that measured the anisotropy in the cosmic microwave background (CMB). QMAP was a balloon-borne telescope that flew twice in 1996, collecting data on degree angular scales with an array of six high electron mobility transistor-based amplifiers (HEMTs). QMAP used an interlocking scan strategy to directly produce high signal-to-noise ratio CMB maps over a limited region of sky. The QMAP gondola was then refitted for ground-based work as the MAT/TOCO experiment. Observations were made from 5200 m on Cerro Toco in Northern Chile in 1997 and 1998 using time domain beam synthesis. MAT/TOCO measured the rise and fall of the CMB angular spectrum, thereby localizing the position of the first peak to lpeak = 216 ± 14. In addition to describing the instruments, we discuss the data selection methods, check for systematic errors, and compare the MAT/TOCO results to those from recent experiments. The previously reported data are updated to account for a small calibration shift and corrected to account for a small contribution from known sources of foreground emission. The resulting amplitude of the first peak for 160 < l < 240 is δTpeak = 80.9 ± 3.4 ± 5.1 μK, where the first uncertainty is statistical and the second is from calibration.