BICEP2/KECK ARRAY V: MEASUREMENTS OF B-MODE POLARIZATION AT DEGREE ANGULAR SCALES AND 150 GHz BY THE KECK ARRAY

Ade, P. A. R.; Ahmed, Z.; Aikin, R. W.; Bock, J. J.; Brevik, J. A.; Crill, B. P.; Filippini, J. P.; Golwala, S. R.; Alexander, K. D.; Bischoff, C. A.; Buder, I.; Buza, V.; Connors, J.; Dvorkin, C.; Barkats, D.; Benton, S. J.; Bullock, E.; Dowell, C. D.; Duband, L.; others, and

doi:10.1088/0004-637X/811/2/126

Title: BICEP2/KECK ARRAY V: MEASUREMENTS OF B-MODE POLARIZATION AT DEGREE ANGULAR SCALES AND 150 GHz BY THE KECK ARRAY

Journal Article · Thu Oct 01 00:00:00 EDT 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/811/2/126· OSTI ID:22525323

Ade, P. A. R. ^[1]; Ahmed, Z. ^[2]; Aikin, R. W.; Bock, J. J.; Brevik, J. A.; Crill, B. P.; Filippini, J. P.; Golwala, S. R. ^[3]; Alexander, K. D.; Bischoff, C. A.; Buder, I.; Buza, V.; Connors, J.; Dvorkin, C. ^[4]; Barkats, D. ^[5]; Benton, S. J. ^[6]; Bullock, E. ^[7]; Dowell, C. D. ^[8]; Duband, L. ^[9]; others, and

School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA (United Kingdom)
Department of Physics, Stanford University, Stanford, CA 94305 (United States)
Department of Physics, California Institute of Technology, Pasadena, CA 91125 (United States)
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, MA 02138 (United States)
Joint ALMA Observatory, ESO, Santiago (Chile)
Department of Physics, University of Toronto, Toronto, ON (Canada)
Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, MN 55455 (United States)
Jet Propulsion Laboratory, Pasadena, CA 91109 (United States)
SBT, Commissariat à l’Energie Atomique, Grenoble (France)

The Keck Array is a system of cosmic microwave background polarimeters, each similar to the Bicep2 experiment. In this paper we report results from the 2012 to 2013 observing seasons, during which the Keck Array consisted of five receivers all operating in the same (150 GHz) frequency band and observing field as Bicep2. We again find an excess of B-mode power over the lensed-ΛCDM expectation of >5σ in the range 30 < ℓ < 150 and confirm that this is not due to systematics using jackknife tests and simulations based on detailed calibration measurements. In map difference and spectral difference tests these new data are shown to be consistent with Bicep2. Finally, we combine the maps from the two experiments to produce final Q and U maps which have a depth of 57 nK deg (3.4 μK arcmin) over an effective area of 400 deg{sup 2} for an equivalent survey weight of 250,000 μK{sup −2}. The final BB band powers have noise uncertainty a factor of 2.3 times better than the previous results, and a significance of detection of excess power of >6σ.

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OSTI ID:: 22525323

Journal Information:: Astrophysical Journal, Vol. 811, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X

Country of Publication:: United States

Language:: English

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Title: BICEP2/KECK ARRAY V: MEASUREMENTS OF B-MODE POLARIZATION AT DEGREE ANGULAR SCALES AND 150 GHz BY THE KECK ARRAY

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