Designs for next generation CMB survey strategies from Chile
Designs for next generation CMB survey strategies from Chile
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智利下一代 CMB 调查策略设计
DOI：
10.1117/12.2313898
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Zhu N
中科院分区：
文献类型：
--
作者：
Zhu N
正在建造新的望远镜，以前所未有的灵敏度测量宇宙微波背景(CMB)，包括西蒙斯天文台(SO)、CCAT-PRIME、BICEP阵列、SPT-3G和CMB Stage-4。我们介绍了位于智利的望远镜的观测战略，这些望远镜是由用于开发最近的阿塔卡马宇宙学望远镜(ACT)和北极熊调查的工具提供信息的。与ACT和PolarBear一样，这些策略包括在恒定高度沿方位扫描。我们探索了小口径(0.42m)望远镜(SAT)和大口径(6m)望远镜(LAT)的观测策略。我们研究了以小天空区域为重点寻找膨胀引力波的策略，以及覆盖大约一半低前景天空的策略，以限制相对论物种的有效数量，并通过大尺度结构的引力透镜信号测量中微子质量的总和。我们特别考虑到位于南纬23°，西经67.8°的SO的望远镜硬件和科学目标，提出了这些策略。靠近太阳和月球的观测可以通过望远镜旁瓣向仪器施加额外的功率，从而引入额外的系统学。在明亮的光源下，即使在几十度或更高的温度下，数据中的严重副瓣污染也可能发生。因此，我们提出了几种在望远镜调度中实现日月回避约束的策略。扫描策略也可以是诊断和缓解仪器系统学的强大工具，无论是通过使用多次扫描来平均下一步的系统学，还是通过提供零测试来诊断问题。我们讨论了量化观测策略实现这一点的能力的方法。讨论了解决同时可见区域之间冲突的策略。我们专注于最大限度地增加望远镜用于科学观测的时间。也有必要安排校准测量，但这超出了本工作的范围。这项研究的输出是可以为西蒙斯天文台仪器生成特定时间表命令的算法。
New telescopes are being built to measure the Cosmic Microwave Background (CMB) with unprecedented sensitivity, including Simons Observatory (SO), CCAT-prime, the BICEP Array, SPT-3G, and CMB Stage-4. We present observing strategies for telescopes located in Chile that are informed by the tools used to develop recent Atacama Cosmology Telescope (ACT) and Polarbear surveys. As with ACT and Polarbear, these strategies are composed of scans that sweep in azimuth at constant elevation.We explore observing strategies for both small (0.42 m) aperture telescopes (SAT) and a large (6 m) aperture telescope (LAT). We study strategies focused on small sky areas to search for inflationary gravitational waves as well as strategies spanning roughly half the low-foreground sky to constrain the effective number of relativistic species and measure the sum of neutrino masses via the gravitational lensing signal due to large scale structure. We present these strategies specifically considering the telescope hardware and science goals of the SO, located at 23° South latitude, 67.8° West longitude.Observations close to the Sun and the Moon can introduce additional systematics by applying additional power to the instrument through telescope sidelobes. Significant side lobe contamination in the data can occur even at tens of degrees or more from bright sources. Therefore, we present several strategies that implement Sun and Moon avoidance constraints into the telescope scheduling.Scan strategies can also be a powerful tool to diagnose and mitigate instrumental systematics either by using multiple scans to average down systematics or by providing null tests to diagnose problems. We discuss methods for quantifying the ability of an observation strategy to achieve this.Strategies for resolving conflicts between simultaneously visible fields are discussed. We focus on maximizing telescope time spent on science observations. It will also be necessary to schedule calibration measurements, however that is beyond the scope of this work. The outputs of this study are algorithms that can generate specific schedule commands for the Simons Observatory instruments.
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影响因子：
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作者：
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DOI：
--
发表时间：
2001
期刊：
影响因子：
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作者：
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DOI：
10.2172/1352047
发表时间：
2016-10
期刊：
--
影响因子：
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影响因子：
6.4
作者：
J. Filippini;P. Ade;M. Amiri;S. Benton;R. Bihary;J. Bock;J. Bock;J. Bond;J. A. Bonetti;S. Bryan;B. Burger;H. Chiang;C. Contaldi;B. Crill;O. Doré;O. Doré;M. Farhang;L. Fissel;N. Gandilo;S. Golwala;J. Gudmundsson;M. Halpern;M. Hasselfield;G. Hilton;W. Holmes;V. Hristov;K. Irwin;W. Jones;C. Kuo;C. MacTavish;P. Mason;T. Montroy;T. Morford;C. Netterfield;D. O'Dea;A. Rahlin;C. Reintsema;J. Ruhl;M. Runyan;M. Schenker;J. Shariff;J. Soler;A. Trangsrud;C. Tucker;R. Tucker;A. Turner
通讯作者：
A. Turner
Q/U 成像实验仪
DOI：
10.1088/0004-637x/768/1/9
发表时间：
2013
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Bischoff C
通讯作者：
Bischoff C