BICEP2. III. INSTRUMENTAL SYSTEMATICS

被引：39

作者：

Ade, P. A. R. ^{[1
]}

Aikin, R. W. ^{[2
]}

Barkats, D. ^{[3
]}

Benton, S. J. ^{[4
]}

Bischoff, C. A. ^{[5
]}

Bock, J. J. ^{[6
]}

Brevik, J. A. ^{[2
]}

Buder, I. ^{[5
]}

Bullock, E. ^{[7
]}

Dowell, C. D. ^{[6
]}

Duband, L. ^{[8
]}

Filippini, J. P. ^{[2
,9
]}

Fliescher, S. ^{[10
]}

Golwala, S. R. ^{[2
]}

Halpern, M. ^{[11
]}

Hasselfield, M. ^{[11
]}

Hildebrandt, S. R. ^{[2
,6
]}

Hilton, G. C. ^{[12
]}

Irwin, K. D. ^{[12
,13
,14
]}

Karkare, K. S. ^{[5
]}

Kaufman, J. P. ^{[15
]}

Keating, B. G. ^{[15
]}

Kernasovskiy, S. A. ^{[13
]}

Kovac, J. M. ^{[5
]}

Kuo, C. L. ^{[13
,14
]}

Leitch, E. M. ^{[16
]}

Lueker, M. ^{[2
]}

Netterfield, C. B. ^{[4
]}

Nguyen, H. T. ^{[6
]}

O'Brient, R. ^{[6
]}

Ogburn, R. W. ^{[13
,14
]}

Orlando, A. ^{[15
]}

Pryke, C. ^{[10
]}

Richter, S. ^{[5
]}

Schwarz, R. ^{[10
]}

Sheehy, C. D. ^{[10
]}

Staniszewski, Z. K. ^{[2
]}

Sudiwala, R. V. ^{[1
]}

Teply, G. P. ^{[2
]}

Tolan, J. E. ^{[13
]}

Turner, A. D. ^{[6
]}

Vieregg, A. G. ^{[16
,17
]}

Wong, C. L. ^{[5
]}

Yoon, K. W. ^{[13
,14
]}

机构：

[1] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales

[2] CALTECH, Dept Phys, Pasadena, CA 91125 USA

[3] ESO, Joint ALMA Observ, Santiago, Chile

[4] Univ Toronto, Dept Phys, Toronto, ON, Canada

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[6] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[7] Univ Minnesota, Minnesota Inst Astrophys, Minneapolis, MN 55455 USA

[8] CEA Grenoble, SBT, F-38054 Grenoble, France

[9] Univ Illinois, Dept Phys, Urbana, IL 61820 USA

[10] Univ Minnesota, Dept Phys, Minneapolis, MN 55455 USA

[11] Univ British Columbia, Dept Phys & Astron, Vancouver, BC, Canada

[12] NIST, Boulder, CO 80305 USA

[13] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[14] SLAC Natl Accelerator Lab, Kavli Inst Particle Astrophys & Cosmol, Menlo Pk, CA 94025 USA

[15] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[16] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[17] Univ Chicago, Enrico Fermi Inst, Dept Phys, Chicago, IL 60637 USA

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 814卷 / 02期

基金：

加拿大创新基金会; 美国国家科学基金会;

关键词：

cosmic background radiation; cosmology: observations; gravitational waves; inflation; instrumentation: polarimeters; methods: data analysis; BACKGROUND POWER SPECTRUM; GRAVITY-WAVES; MICROWAVE; POLARIZATION; ANISOTROPY; PROBE; CONSTRAINTS; TEMPERATURE; CALIBRATION; TELESCOPE;

D O I：

10.1088/0004-637X/814/2/110

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In a companion paper, we have reported a >5 sigma detection of degree scale B-mode polarization at 150 GHz by the BICEP2 experiment. Here we provide a detailed study of potential instrumental systematic contamination to that measurement. We focus extensively on spurious polarization that can potentially arise from beam imperfections. We present a heuristic classification of beam imperfections according to their symmetries and uniformities, and discuss how resulting contamination adds or cancels in maps that combine observations made at multiple orientations of the telescope about its boresight axis. We introduce a technique, which we call "deprojection," for filtering the leading order beam-induced contamination from time-ordered data, and show that it reduces power in BICEP2's actual and null-test BB spectra consistent with predictions using high signal-to-noise beam shape measurements. We detail the simulation pipeline that we use to directly simulate instrumental systematics and the calibration data used as input to that pipeline. Finally, we present the constraints on BB contamination from individual sources of potential systematics. We find that systematics contribute BB power that is a factor of similar to 10x below BICEP2's three-year statistical uncertainty, and negligible compared to the observed BB signal. The contribution to the best-fit tensor/scalar ratio is at a level equivalent to r = (3-6) x 10(-3).

引用

页数：28

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