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. ORCID: https://orcid.org/0000-0002-5127-0401, Aguilar, M., Akiba, Y., Arnold, K., Baccigalupi, C., Barron, D., Beck, D., Bianchini, F., Boettger, D., Borrill, J., Chapman, S., Chinone, Y., Crowley, K., Cukierman, A., Dünner, R., Dobbs, M., Ducout, A., Elleflot, T., Errard, J., Fabbian, G., Feeney, S. M., Feng, C., Fujino, T., Galitzki, N., Gilbert, A., Goeckner-Wald, N., Groh, J. C., Hall, G., Halverson, N., Hamada, T., Hasegawa, M., Hazumi, M., Hill, C. A., Howe, L., Inoue, Y., Jaehnig, G., Jaffe, A. H., Jeong, O., Kaneko, D., Katayama, N., Keating, B., Keskitalo, R., Kisner, T., Krachmalnicoff, N., Kusaka, A., Le Jeune, M., Lee, A. T., Leitch, E. M., Leon, D., Linder, E., Lowry, L., Matsuda, F., Matsumura, T., Minami, Y., Montgomery, J., Navaroli, M., Nishino, H., Paar, H., Peloton, J., Pham, A. T. P., Poletti, D., Puglisi, G., Reichardt, C. L., Richards, P. L., Ross, C., Segawa, Y., Sherwin, B. D., Silva-Feaver, M., Siritanasak, P., Stebor, N., Stompor, R., Suzuki, A., Tajima, O., Takakura, S., Takatori, S., Tanabe, D., Teply, G. P., Tomaru, T., Tucker, C. ORCID: https://orcid.org/0000-0002-1851-3918, Whitehorn, N. and Zahn, A. 2017. A measurement of the cosmic microwave background B-mode polarization power spectrum at subdegree scales from two years of POLARBEAR data. Astrophysical Journal 848 (2) , 121. 10.3847/1538-4357/aa8e9f

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Abstract

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 $500\leqslant {\ell }\leqslant 2100$, 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 L relative to the Planck 2015 best-fit model prediction. We obtain ${A}_{L}={0.60}_{-0.24}^{+0.26}(\mathrm{stat}{)}_{-0.04}^{+0.00}(\mathrm{inst})$ ± 0.14(foreground) ± 0.04(multi), where ${A}_{L}=1$ is the fiducial ΛCDM value.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Additional Information:	The POLARBEAR Collaboration
Publisher:	American Astronomical Society
ISSN:	0004-637X
Date of First Compliant Deposit:	17 November 2017
Date of Acceptance:	20 September 2017
Last Modified:	07 May 2023 21:31
URI:	https://orca.cardiff.ac.uk/id/eprint/106682

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