A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data

Ade, P. A. R.; Aguilar, M.; Akiba, Y.; Arnold, K.; Crowley, K.; Elleflot, T.; Baccigalupi, C.; Barron, D.; Borrill, J.; Beck, D.; Errard, J.; Bianchini, F.; Boettger, D.; Dünner, R.; Chapman, S.; Chinone, Y.; Cukierman, A.; Dobbs, M.; Ducout, A.; others, and

doi:10.3847/1538-4357/AA8E9F

Title: A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data

Journal Article · Fri Oct 20 00:00:00 EDT 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA8E9F· OSTI ID:22875675

Ade, P. A. R. ^[1]; Aguilar, M. ^[2]; Akiba, Y. ^[3]; Arnold, K.; Crowley, K.; Elleflot, T. ^[4]; Baccigalupi, C. ^[5]; Barron, D.; Borrill, J. ^[6]; Beck, D.; Errard, J. ^[7]; Bianchini, F. ^[8]; Boettger, D.; Dünner, R. ^[9]; Chapman, S. ^[10]; Chinone, Y.; Cukierman, A. ^[11]; Dobbs, M. ^[12]; Ducout, A. ^[13]; others, and

School of Physics and Astronomy, Cardiff University, Cardiff CF10 3XQ (United Kingdom)
Departamento de Física, FCFM, Universidad de Chile, Blanco Encalada 2008, Santiago (Chile)
SOKENDAI (The Graduate University for Advanced Studies), Hayama, Miura District, Kanagawa 240-0115 (Japan)
Department of Physics, University of California, San Diego, CA 92093-0424 (United States)
The International School for Advanced Studies, SISSA, Via Bonomea 265, I-34136, Trieste (Italy)
Space Sciences Laboratory, University of California, Berkeley, CA 94720 (United States)
AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité (France)
School of Physics, University of Melbourne, Parkville, VIC 3010 (Australia)
Centro de Astro-Ingeniería, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago (Chile)
Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, B3H4R2 (Canada)
Department of Physics, University of California, Berkeley, CA 94720 (United States)
Physics Department, McGill University, Montreal, QC H3A 0G4 (Canada)
Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583 (Japan)

We report an improved measurement of the cosmic microwave background B-mode polarization power spectrum with the Polarbear experiment at 150 GHz. By adding new data collected during the second season of observations (2013–2014) to re-analyzed data from the first season (2012–2013), we have reduced twofold the band-power uncertainties. The band powers are reported over angular multipoles 500⩽ℓ⩽2100, where the dominant B-mode signal is expected to be due to the gravitational lensing of E-modes. We reject the null hypothesis of no B-mode polarization at a confidence of 3.1σ including both statistical and systematic uncertainties. We test the consistency of the measured B-modes with the Λ Cold Dark Matter (ΛCDM) framework by fitting for a single lensing amplitude parameter A {sub L} relative to the Planck 2015 best-fit model prediction. We obtain A{sub L}=0.60{sub −0.24}{sup +0.26}(stat){sub −0.04}{sup +0.00}(inst) ± 0.14(foreground) ± 0.04(multi), where A{sub L}=1 is the fiducial ΛCDM value.

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OSTI ID:: 22875675

Journal Information:: Astrophysical Journal, Vol. 848, 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: A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data

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