Improved Upper Limit on Degree-scale CMB B-mode Polarization Power from the 670 Square-degree POLARBEAR Survey

S. Adachi, T. Adkins, M. A.O. Aguilar Faúndez, K. S. Arnold, C. Baccigalupi, D. Barron, S. Chapman, K. Cheung, Y. Chinone, K. T. Crowley, T. Elleflot, J. Errard, G. Fabbian, C. Feng, T. Fujino, N. Galitzki, N. W. Halverson, M. Hasegawa, M. Hazumi, H. HiroseL. Howe, J. Ito, O. Jeong, D. Kaneko, N. Katayama, B. Keating, T. Kisner, N. Krachmalnicoff, A. Kusaka, A. T. Lee, E. Linder, A. I. Lonappan, L. N. Lowry, F. Matsuda, T. Matsumura, Y. Minami, M. Murata, H. Nishino, Y. Nishinomiya, D. Poletti, C. L. Reichardt, C. Ross, Y. Segawa, P. Siritanasak, R. Stompor, A. Suzuki, O. Tajima, S. Takakura, S. Takatori, D. Tanabe, G. Teply, K. Yamada, Y. Zhou

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Article number101
JournalAstrophysical Journal
Issue number2
Publication statusPublished - Jun 1 2022
Externally publishedYes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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