BICEP2 III: Instrumental systematics

Ade, P. A. R.

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

Title: BICEP2 III: Instrumental systematics

Journal Article · Mon Nov 23 00:00:00 EST 2015 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/814/2/110· OSTI ID:1263414

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

Cardiff Univ., Cardiff (United Kingdom). et al.

In a companion paper, we have reported a >5σ 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 ~10× below Bicep2's three-year statistical uncertainty, and negligible compared to the observed BB signal. Lastly, the contribution to the best-fit tensor/scalar ratio is at a level equivalent to r = (3–6) × 10^–3.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: Bicep2 Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1263414

Report Number(s):: SLAC-PUB-16624; arXiv:1502.00608

Journal Information:: The Astrophysical Journal (Online), Vol. 814, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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A Probe of Primordial Gravity Waves and Vorticity Kamionkowski, Marc; Kosowsky, Arthur; Stebbins, Albert arXiv https://doi.org/10.48550/arxiv.astro-ph/9609132	text	January 1996

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Bicep2/ KECK ARRAY VIII: MEASUREMENT OF GRAVITATIONAL LENSING FROM LARGE-SCALE B -MODE POLARIZATION Ade, P. A. R.; Ahmed, Z.; Aikin, R. W. The Astrophysical Journal, Vol. 833, Issue 2 https://doi.org/10.3847/1538-4357/833/2/228	journal	December 2016
BICEP2/Keck Array XI: Beam Characterization and Temperature-to-Polarization Leakage in the BK15 Data Set Ade, P. A. R.; Ahmed, Z.; Aikin, R. W. The Astrophysical Journal, Vol. 884, Issue 2 https://doi.org/10.3847/1538-4357/ab391d	journal	October 2019
Performance of a continuously rotating half-wave plate on the POLARBEAR telescope Takakura, Satoru; Aguilar, Mario; Akiba, Yoshiki arXiv https://doi.org/10.48550/arxiv.1702.07111	text	January 2017
BICEP2 / Keck Array IX: New Bounds on Anisotropies of CMB Polarization Rotation and Implications for Axion-Like Particles and Primordial Magnetic Fields Array, Keck; Collaborations, Bicep2; Ade, P. A. R. arXiv https://doi.org/10.48550/arxiv.1705.02523	text	January 2017
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