A Measurement of the CMB E-mode Angular Power Spectrum at Subdegree Scales from 670 Square Degrees of POLARBEAR Data

Adachi, S.; Aguilar Faúndez, M. O.; Arnold, K.; Baccigalupi, C.; Barron, D.; Beck, D.; Bianchini, F.; Chapman, S.; Cheung, K.; Chinone, Y.; Crowley, K.; Dobbs, M.; Bouhargani, H. El; Elleflot, T.; Errard, J.; Fabbian, G.; Feng, C.; Fujino, T.; Galitzki, N.; Goeckner-Wald, N.; Groh, J.; Hall, G.; Hasegawa, M.; Hazumi, M.; Hirose, H.; Jaffe, A. H.; Jeong, O.; Kaneko, D.; Katayama, N.; Keating, B.; Kikuchi, S.; Kisner, T.; Kusaka, A.; Lee, A. T.; Leon, D.; Linder, E.; Lowry, L. N.; Matsuda, F.; Matsumura, T.; Minami, Y.; Navaroli, M.; Nishino, H.; Pham, A. P.; Poletti, D.; Reichardt, C. L.; Segawa, Y.; Siritanasak, P.; Tajima, O.; Takakura, S.; Takatori, S.; Tanabe, D.; Teply, G. P.; Tsai, C.; Vergès, C.; Westbrook, B.; Zhou, Y.

doi:10.3847/1538-4357/abbacd

Title: A Measurement of the CMB E-mode Angular Power Spectrum at Subdegree Scales from 670 Square Degrees of POLARBEAR Data

Journal Article · Fri Nov 20 00:00:00 EST 2020 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/abbacd· OSTI ID:1762202

;

; Chapman, S.; Cheung, K.;

;

; Dobbs, M.;

;

; Feng, C.; Fujino, T.; Galitzki, N.; Goeckner-Wald, N. more »

In this work, we report a measurement of the E-mode polarization power spectrum of the cosmic microwave background (CMB) using 150 GHz data taken from 2014 July to 2016 December with the POLARBEAR experiment. We reach an effective polarization map noise level of 32 μK-arcmin across an observation area of 670 square degrees. We measure the EE power spectrum over the angular multipole range 500 ≤ ℓ < 3000, tracing the third to seventh acoustic peaks with high sensitivity. The statistical uncertainty on E-mode bandpowers is ~2.3 μK² at ℓ ~ 1000, with a systematic uncertainty of 0.5 mK². Furthermore, the data are consistent with the standard ΛCDM cosmological model with a probability-to-exceed of 0.38. We combine recent CMB E-mode measurements and make inferences about cosmological parameters in ΛCDM as well as in extensions to ΛCDM. Adding the ground-based CMB polarization measurements to the Planck data set reduces the uncertainty on the Hubble constant by a factor of 1.2 to H0 = 67.20 ±0.57 km s^-1 Mpc^-1. When allowing the number of relativistic species (Neff ) to vary, we find N_eff = 2.94 ±0.16, which is in good agreement with the standard value of 3.046. Instead allowing the primordial helium abundance (Y_He) to vary, the data favor Y_He = 0.248 ±0.012. This is very close to the expectation of 0.2467 from big bang nucleosynthesis. When varying both Y_He and N_eff, we find N_eff = 2.70 ±0.26 and Y_He = 0.262 ±0.015.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); Gordon and Betty Moore Foundation; Simons Foundation; JSPS KAKENHI; Australian Research Council; European Research Council (ERC)

Contributing Organization:: The Polarbear Collaboration

Grant/Contract Number:: AC02-05CH11231; AST-0618398; AST-1212230; 4633; 034079; 58724; FT150100074; JP16K21744; 18H05539

OSTI ID:: 1762202

Journal Information:: The Astrophysical Journal (Online), Vol. 904, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: A Measurement of the CMB E-mode Angular Power Spectrum at Subdegree Scales from 670 Square Degrees of POLARBEAR Data

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