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

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

doi:10.3847/1538-4357/ac6809

We report an improved measurement of the degree-scale cosmic microwave background B-mode angular-power spectrum over 670 deg(2) 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 ?CDM 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.

Improved Upper Limit on Degree-scale CMB B-mode Polarization Power from the 670 Square-degree POLARBEAR Survey / Adachi, S.; Adkins, T.; Aguilar Faúndez, M. A. O.; Arnold, K. S.; Baccigalupi, C.; Barron, D.; Chapman, S.; Cheung, K.; Chinone, Y.; Crowley, K. T.; Elleflot, T.; Errard, J.; Fabbian, G.; Feng, C.; Fujino, T.; Galitzki, N.; Halverson, N. W.; 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, A. T.; Linder, E.; Lonappan, A. I.; Lowry, L. N.; Matsuda, F.; Matsumura, T.; Minami, Y.; Murata, M.; Nishino, H.; Nishinomiya, Y.; Poletti, D.; Reichardt, C. L.; Ross, C.; Segawa, Y.; Siritanasak, P.; Stompor, R.; Suzuki, A.; Tajima, O.; Takakura, S.; Takatori, S.; Tanabe, D.; Teply, G.; Yamada, K.; Zhou, Y.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 931:2(2022), pp. 1-13. [10.3847/1538-4357/ac6809]