학술논문
Improved Upper Limit on Degree-scale CMB B-mode Polarization Power from the 670 Square-degree POLARBEAR Survey
Document Type
article
Author
Adachi, S; Adkins, T; Faúndez, MAO Aguilar; Arnold, KS; Baccigalupi, C; Barron, D; Chapman, S; Cheung, K; Chinone, Y; Crowley, KT; Elleflot, T; Errard, J; Fabbian, G; Feng, C; Fujino, T; Galitzki, N; Halverson, NW; Hasegawa, M; Hazumi, M; Hirose, H; Howe, L; Ito, J; Jeong, O; Kaneko, D; Katayama, N; Keating, B; Kisner, T; Krachmalnicoff, N; Kusaka, A; Lee, AT; Linder, E; Lonappan, AI; Lowry, LN; Matsuda, F; Matsumura, T; Minami, Y; Murata, M; Nishino, H; Nishinomiya, Y; Poletti, D; Reichardt, CL; Ross, C; Segawa, Y; Siritanasak, P; Stompor, R; Suzuki, A; Tajima, O; Takakura, S; Takatori, S; Tanabe, D; Teply, G; Yamada, K; Zhou, Y
Source
The Astrophysical Journal. 931(2)
Subject
Language
Abstract
We report an improved measurement of the degree-scale cosmic microwave background B-mode angular-power spectrum over 670 deg2 sky area at 150 GHz with Polarbear. In the original analysis of the data, errors in the angle measurement of the continuously rotating half-wave plate, a polarization modulator, caused significant data loss. By introducing an angle-correction algorithm, the data volume is increased by a factor of 1.8. We report a new analysis using the larger data set. We find the measured B-mode spectrum is consistent with the ΛCDM model with Galactic dust foregrounds. We estimate the contamination of the foreground by cross-correlating our data and Planck 143, 217, and 353 GHz measurements, where its spectrum is modeled as a power law in angular scale and a modified blackbody in frequency. We place an upper limit on the tensor-to-scalar ratio r < 0.33 at 95% confidence level after marginalizing over the foreground parameters.