A Measurement of the Degree-scale CMB B-mode Angular Power Spectrum with POLARBEAR
AuthorAdachi, S; Faundez, MAOA; Arnold, K; Baccigalupi, C; Barron, D; Beck, D; Beckman, S; Bianchini, F; Boettger, D; Borrill, J; ...
Source TitleAstrophysical Journal Supplement Series
PublisherAmerican Astronomical Society
AffiliationSchool of Physics
Document TypeJournal Article
CitationsAdachi, S., Faundez, M. A. O. A., Arnold, K., Baccigalupi, C., Barron, D., Beck, D., Beckman, S., Bianchini, F., Boettger, D., Borrill, J., Carron, J., Chapman, S., Cheung, K., Chinone, Y., Crowley, K., Cukierman, A., Dobbs, M., El Bouhargani, H., Elleflot, T. ,... Zhou, Y. (2020). A Measurement of the Degree-scale CMB B-mode Angular Power Spectrum with POLARBEAR. Astrophysical Journal, 897 (1), https://doi.org/10.3847/1538-4357/ab8f24.
Access StatusThis item is embargoed and will be available on 2021-07-01. Access full text via the Open Access location
Open Access URLhttps://arxiv.org/pdf/1910.02608
ARC Grant codeARC/FT150100074
The American Astronomical Society. All rights reserved. We present a measurement of the B-mode polarization power spectrum of the cosmic microwave background (CMB) using data taken from 2014 July to 2016 December with the Polarbear experiment. The CMB power spectra are measured using observations at 150 GHz with an instantaneous array sensitivity of NETarray=23μ K√s on a 670 square degree patch of sky centered at (R.A., decl.) = (+0h12m0s, -59°18′). A continuously rotating half-wave plate is used to modulate polarization and to suppress low-frequency noise. We achieve 32 μK arcmin effective polarization map noise with a knee in sensitivity of ℓ = 90, where the inflationary gravitational-wave signal is expected to peak. The measured B-mode power spectrum is consistent with a ΛCDM lensing and single dust component foreground model over a range of multipoles 50 ≤ ℓ ≤ 600. The data disfavor zero CℓBB at 2.2σ using this ℓ range of Polarbear data alone. We cross-correlate our data with Planck full mission 143, 217, and 353 GHz frequency maps and find the low-ℓ B-mode power in the combined data set to be consistent with thermal dust emission. We place an upper limit on the tensor-to-scalar ratio r < 0.90 at the 95% confidence level after marginalizing over foregrounds.
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