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

P. A.R. Ade, M. Aguilar, Y. Akiba, K. Arnold, C. Baccigalupi, D. Barron, D. Beck, F. Bianchini, D. Boettger, J. Borrill, S. Chapman, Y. Chinone, K. Crowley, A. Cukierman, R. Dünner, M. Dobbs, A. Ducout, T. Elleflot, J. Errard, G. FabbianS. M. Feeney, C. Feng, T. Fujino, N. Galitzki, A. Gilbert, N. Goeckner-Wald, J. C. Groh, G. Hall, N. Halverson, T. Hamada, M. Hasegawa, M. Hazumi, C. A. Hill, L. Howe, Y. Inoue, G. Jaehnig, A. H. Jaffe, O. Jeong, D. Kaneko, N. Katayama, B. Keating, R. Keskitalo, T. Kisner, N. Krachmalnicoff, A. Kusaka, M. Le Jeune, A. T. Lee, E. M. Leitch, D. Leon, E. Linder, L. Lowry, F. Matsuda, T. Matsumura, Y. Minami, J. Montgomery, M. Navaroli, H. Nishino, H. Paar, J. Peloton, A. T.P. Pham, D. Poletti, G. Puglisi, C. L. Reichardt, P. L. Richards, C. Ross, Y. Segawa, B. D. Sherwin, M. Silva-Feaver, P. Siritanasak, N. Stebor, R. Stompor, A. Suzuki, O. Tajima, S. Takakura, S. Takatori, D. Tanabe, G. P. Teply, T. Tomaru, C. Tucker, N. Whitehorn, A. Zahn

研究成果: 雜誌貢獻期刊論文同行評審

62 引文 斯高帕斯(Scopus)

摘要

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.

原文???core.languages.en_GB???
文章編號121
期刊Astrophysical Journal
848
發行號2
DOIs
出版狀態已出版 - 20 10月 2017

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