A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data
- Author(s): Ade, PAR
- 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, SM
- Feng, C
- Fujino, T
- Galitzki, N
- Gilbert, A
- Goeckner-Wald, N
- Groh, JC
- Hall, G
- Halverson, N
- Hamada, T
- Hasegawa, M
- Hazumi, M
- Hill, CA
- Howe, L
- Inoue, Y
- Jaehnig, G
- Jaffe, AH
- Jeong, O
- Kaneko, D
- Katayama, N
- Keating, B
- Keskitalo, R
- Kisner, T
- Krachmalnicoff, N
- Kusaka, A
- Jeune, ML
- Lee, AT
- Leitch, EM
- Leon, D
- Linder, E
- Lowry, L
- Matsuda, F
- Matsumura, T
- Minami, Y
- Montgomery, J
- Navaroli, M
- Nishino, H
- Paar, H
- Peloton, J
- Pham, ATP
- Poletti, D
- Puglisi, G
- Reichardt, CL
- Richards, PL
- Ross, C
- Segawa, Y
- Sherwin, BD
- Silva-Feaver, M
- Siritanasak, P
- Stebor, N
- Stompor, R
- Suzuki, A
- Tajima, O
- Takakura, S
- et al.
Published Web Location
https://doi.org/10.3847/1538-4357/aa8e9fAbstract
© 2017. The American Astronomical Society. All rights reserved. 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 L = 0.60 +0.26-0.24(stat)+0.00-0.04 (inst) ± 0.14(foreground) ± 0.04(multi), where A L = 1 relative to the Planck 2015 best-fit model prediction. We obtain ±0.14(foreground) ±0.04(multi), where is the fiducial ΛCDM value.