Results from the Atacama B-mode Search (ABS) experiment

被引:41
作者
Kusaka, Akito [1 ,2 ,3 ]
Appel, John [1 ,4 ]
Essinger-Hileman, Thomas [1 ,5 ]
Beall, James A. [6 ]
Campusano, Luis E. [7 ]
Cho, Hsiao-Mei [8 ]
Choi, Steve K. [1 ]
Crowley, Kevin [1 ]
Fowler, Joseph W. [6 ]
Gallardo, Patricio [9 ,10 ]
Hasselfield, Matthew [11 ]
Hilton, Gene [6 ]
Ho, Shuay-Pwu P. [1 ]
Irwin, Kent [8 ,12 ]
Jarosik, Norman [1 ]
Niemack, Michael D. [9 ]
Nixon, Glen W. [1 ,13 ]
Nolta, Michael [14 ]
Page, Lyman A., Jr. [1 ]
Palma, Gonzalo A. [15 ]
Parker, Lucas [1 ,16 ]
Raghunathan, Srinivasan [7 ,17 ]
Reintsema, Carl D. [6 ]
Sievers, Jonathan [18 ,19 ]
Simon, Sara M. [1 ,20 ]
Staggs, Suzanne T. [1 ]
Visnjic, Katerina [1 ]
Yoon, Ki-Won [8 ]
机构
[1] Princeton Univ, Dept Phys, Jadwin Hall, Princeton, NJ 08544 USA
[2] Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA
[3] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan
[4] Johns Hopkins Univ, Dept Phys & Astron, 3400 N Charles St, Baltimore, MD 21218 USA
[5] NASA, Goddard Space Flight Ctr, Code 665, Greenbelt, MD 20771 USA
[6] NIST, Boulder, CO 80305 USA
[7] Univ Chile, Dept Astronom, Camino Observ 1515, Santiago, Chile
[8] Stanford Linear Accelerator Ctr, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA
[9] Cornell Univ, Dept Phys, Ithaca, NY 14853 USA
[10] Pontificia Univ Catolica Chile, Dept Astron & Astrophys, 4860 Casilla 306, Santiago 22, Chile
[11] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA
[12] Stanford Univ, Dept Phys, Stanford, CA 94305 USA
[13] Citadel Secur, 131 South Dearborn St, Chicago, IL USA
[14] Univ Toronto, Canadian Inst Theoret Astrophys, 60 St George St, Toronto, ON M5S 3H8, Canada
[15] Univ Chile, Dept Fis, FCFM, Blanco Encalada 2008, Santiago, Chile
[16] Los Alamos Natl Lab, Space & Remote Sensing, MS D436, Los Alamos, NM 87544 USA
[17] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia
[18] Univ KwaZulu Natal Durban, Sch Chem & Phys, ZA-4041 Durban, South Africa
[19] KZN Node, Natl Inst Theoret Phys NITheP, Durban, South Africa
[20] Univ Michigan, Dept Phys, 450 Church St, Ann Arbor, MI 48109 USA
基金
美国国家科学基金会; 加拿大创新基金会; 澳大利亚研究理事会; 美国国家航空航天局;
关键词
CMBR experiments; CMBR polarisation; gravitational waves and CMBR polarization; physics of the early universe; MICROWAVE BACKGROUND POLARIZATION; COUPLED TES POLARIMETERS; GALACTIC DUST EMISSION; POWER-SPECTRUM; SCALE POLARIZATION; HIGH-FREQUENCY; GRAVITY-WAVES; ANISOTROPY; TEMPERATURE; RADIATION;
D O I
10.1088/1475-7516/2018/09/005
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Atacama B-mode Search is an experiment designed to measure the cosmic microwave background polarization at large angular scales (l > 40). It observes at 145 GHz from a site at 5,190 m elevation in northern Chile. The noise equivalent polarization temperature, or NEQ, is 41 mu K root s. One of the unique features of ABS is its use of a rapidly rotating ambient-temperature half-wave plate (HWP) as the first optical element. The HWP spins at 2.55 Hz to modulate the incident polarized signal at frequencies above where instrument white noise dominates over atmospheric fluctuations and other sources of low-frequency noise. We report here on the analysis of data from a 2,400 deg(2) region of sky. We perform a blind analysis to reduce potential bias. After unblinding, we find agreement with the Planck TE and EE measurements on the same region of sky, with a derived calibration factor of 0.89 +/- 0.10. We marginally detect polarized dust emission (at 3.2 sigma for EE and 2.2 sigma for BB) and give an upper limit on the tensor-to-scalar ratio of r < 2.3 (95% confidence level) with the equivalent of 100 on-sky days of observation. We also present a new measurement of the polarization of Tau A and introduce new methods for calibration and data analysis associated with HWP-based observations.
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页数:41
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