干旱区生态环境知识资源中心(Arid): Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: 40 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance

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DOI	10.3847/1538-4357/ab76c2
	Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: 40 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
	Xu, Zhilei 1,2; Brewer, Michael K.2; Rojas, Pedro Fluxa 3,4; Li, Yunyang 2; Osumi, Keisuke 2; Pradenas, Bastian 2,5; Ali, Aamir 2,6; Appel, John W.2; Bennett, Charles L.2; Bustos, Ricardo 7; Chan, Manwei 2; Chuss, David T.8; Cleary, Joseph 2; Couto, Jullianna Denes 2; Dahal, Sumit 2; Datta, Rahul 2; Denis, Kevin L.9; Dunner, Rolando 3,4; Eimer, Joseph R.2; Essinger-Hileman, Thomas 2,9; Gothe, Dominik 2; Harrington, Kathleen 2,10; Iuliano, Jeffrey 2; Karakla, John 2; Marriage, Tobias A.2; Miller, Nathan J.2,9; Nunez, Carolina 2; Padilla, Ivan L.2; Parker, Lucas 2,11; Petroff, Matthew A.2; Reeves, Rodrigo 12; Rostem, Karwan 9; Valle, Deniz Augusto 2; Watts, Duncan J.2; Weiland, Janet L.2; Wollack, Edward J.9
通讯作者	Xu, Zhilei
来源期刊	ASTROPHYSICAL JOURNAL
ISSN	0004-637X
EISSN	1538-4357
出版年	2020
卷号	891 期号:2
英文摘要	The Cosmology Large Angular Scale Surveyor (CLASS) is a telescope array that observes the cosmic microwave background (CMB) over 75% of the sky from the Atacama Desert, Chile, at frequency bands centered near 40, 90, 150, and 220 GHz. CLASS measures the large angular scale (1 degrees less than or similar to theta <= 90 degrees) CMB polarization to constrain the tensor-to-scalar ratio at the r similar to 0.01 level and the optical depth to last scattering to the sample variance limit. This paper presents the optical characterization of the 40 GHz telescope during its first observation era, from 2016 September to 2018 February. High signal-to-noise observations of the Moon establish the pointing and beam calibration. The telescope boresight pointing variation is <0.degrees 023 (<1.6% of the beam's full width at half maximum (FWHM)). We estimate beam parameters per detector and in aggregate, as in the CMB survey maps. The aggregate beam has an FWHM of 1.degrees 579 +/- 0.degrees 001 and a solid angle of 838 +/- 6 mu sr, consistent with physical optics simulations. The corresponding beam window function has a sub-percent error per multipole at l < 200. An extended 90 degrees beam map reveals no significant far sidelobes. The observed Moon polarization shows that the instrument polarization angles are consistent with the optical model and that the temperature-to-polarization leakage fraction is <10(-4) (95% C.L.). We find that the Moon-based results are consistent with measurements of M42, RCW.38, and Tau A from CLASS's CMB survey data. In particular, Tau A measurements establish degree-level precision for instrument polarization angles.
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:000521380800001
WOS关键词	INFLATIONARY UNIVERSE ; DIELECTRIC-PROPERTIES ; RADIO-EMISSION ; MICROWAVE ; TRANSITION ; MOON ; EDGE ; FLATNESS ; HORIZON ; SYSTEM
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/2XILL650/314114
作者单位	1.Univ Penn, Dept Phys & Astron, 209 South 33rd St, Philadelphia, PA 19104 USA; 2.Johns Hopkins Univ, Dept Phys & Astron, 3701 San Martin Dr, Baltimore, MD 21218 USA; 3.Pontificia Univ Catolica Chile, Inst Astrofis, Fac Fis, Ave Vicuna Mackenna 4860, Santiago 7820436, Chile; 4.Pontificia Univ Catolica Chile, Ctr Astroingn, Fac Fis, Ave Vicuna Mackenna 4860, Santiago 7820436, Chile; 5.Univ Chile, FCFM, Dept Fis, Blanco Encalada 2008, Santiago, Chile; 6.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA; 7.Univ Catolica Santisima Concepcion, Fac Ingn, Alonso Ribera 2850, Concepcion, Chile; 8.Villanova Univ, Dept Phys, 800 Lancaster Ave, Villanova, PA 19085 USA; 9.Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA; 10.Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA; 11.Los Alamos Natl Lab, Space & Remote Sensing, MS B244, Los Alamos, NM 87544 USA; 12.Univ Concepcion, Dept Astron, CePIA, Concepcion, Chile
推荐引用方式 GB/T 7714	Xu, Zhilei,Brewer, Michael K.,Rojas, Pedro Fluxa,et al. Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: 40 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance[J]. University of California, Berkeley,2020,891(2).
APA	Xu, Zhilei.,Brewer, Michael K..,Rojas, Pedro Fluxa.,Li, Yunyang.,Osumi, Keisuke.,...&Wollack, Edward J..(2020).Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: 40 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance.ASTROPHYSICAL JOURNAL,891(2).
MLA	Xu, Zhilei,et al."Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: 40 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance".ASTROPHYSICAL JOURNAL 891.2(2020).