干旱区生态环境知识资源中心(Arid): Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q band

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DOI	10.3847/1538-4357/ab64e2
	Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q band
	Petroff, Matthew A.1; Eimer, Joseph R.1; Harrington, Kathleen 1,2; Ali, Aamir 1,3; Appel, John W.1; Bennett, Charles L.1; Brewer, Michael K.1; Bustos, Ricardo 4; Chan, Manwei 1; Chuss, David T.5; Cleary, Joseph 1; Couto, Jullianna Denes 1; Dahal, Sumit 1; Dunner, Rolando 6,7; Essinger-Hileman, Thomas 8; Fluxa Rojas, Pedro 6,7; Gothe, Dominik 1; Iuliano, Jeffrey 1; Marriage, Tobias A.1; Miller, Nathan J.1,8; Nunez, Carolina 1; Padilla, Ivan L.1; Parker, Lucas 9; Reeves, Rodrigo 10; Rostem, Karwan 8; Valle, Deniz Augusto Nunes 1; Watts, Duncan J.1; Weiland, Janet L.1; Wollack, Edward J.8; Xu, Zhilei 1,11
通讯作者	Petroff, Matthew A.
来源期刊	ASTROPHYSICAL JOURNAL
ISSN	0004-637X
EISSN	1538-4357
出版年	2020
卷号	889 期号:2
英文摘要	The Earth's magnetic field induces Zeeman splitting of the magnetic dipole transitions of molecular oxygen in the atmosphere, which produces polarized emission in the millimeter-wave regime. This polarized emission is primarily circularly polarized and manifests as a foreground with a dipole-shaped sky pattern for polarization-sensitive ground-based cosmic microwave background experiments, such as the Cosmology Large Angular Scale Surveyor (CLASS), which is capable of measuring large angular scale circular polarization. Using atmospheric emission theory and radiative transfer formalisms, we model the expected amplitude and spatial distribution of this signal and evaluate the model for the CLASS observing site in the Atacama Desert of northern Chile. Then, using two years of observations at 323 to 43.7 GHz from the CLASS Q-band telescope, we present a detection of this signal and compare the observed signal to that predicted by the model. We recover an angle between magnetic north and true north of -55 06, which is consistent with the expectation of -59 for the CLASS observing site. When comparing dipole sky patterns fit to both simulated and data-derived sky maps, the dipole directions match to within a degree, and the measured amplitudes match to within similar to 20%.
英文关键词	Cosmic microwave background radiation Observational cosmology Polarimeters Astronomical instrumentation Atmospheric effects
类型	Article
语种	英语
国家	USA ; Chile
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000520190600001
WOS关键词	MICROWAVE BACKGROUND POLARIZATION ; SPECTRUM LINE-PROFILES ; FINE-STRUCTURE LINES ; MOLECULAR-OXYGEN ; PROPAGATION ; ABSORPTION ; EMISSION ; WAVES ; SHAPE
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
来源机构	University of California, Berkeley
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314113
作者单位	1.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA; 2.Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA; 3.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA; 4.Univ Catolica Santisima Concepcion, Fac Ingn, Concepcion, Chile; 5.Villanova Univ, Dept Phys, Villanova, PA 19085 USA; 6.Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Santiago 7820436, Chile; 7.Pontificia Univ Catolica Chile, Fac Fis, Ctr Astroingn, Santiago 7820436, Chile; 8.NASA, Goddard Space Flight Ctr, Code 665, Greenbelt, MD 20771 USA; 9.Los Alamos Natl Lab, Space & Remote Sensing, MS B244, Los Alamos, NM 87544 USA; 10.Univ Concepcion, Dept Astron, CePIA, Concepcion, Chile; 11.Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
推荐引用方式 GB/T 7714	Petroff, Matthew A.,Eimer, Joseph R.,Harrington, Kathleen,et al. Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q band[J]. University of California, Berkeley,2020,889(2).
APA	Petroff, Matthew A..,Eimer, Joseph R..,Harrington, Kathleen.,Ali, Aamir.,Appel, John W..,...&Xu, Zhilei.(2020).Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q band.ASTROPHYSICAL JOURNAL,889(2).
MLA	Petroff, Matthew A.,et al."Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q band".ASTROPHYSICAL JOURNAL 889.2(2020).