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A measurement of the CMB e-mode angular power spectrum at subdegree scales from 670 square degrees of POLARBEAR data
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posted on 2023-06-09, 22:35 authored by S Adachi, M A O Aguilar Faúndez, K Arnold, C Baccigalupi, D Barron, D Beck, F Bianchini, S Chapman, K Cheung, Y Chinone, K Crowley, M Dobbs, H El Bouhargani, T Elleflot, Giulio Fabbian, The Polarbear Collaboration, othersWe 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 mK-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. The data are consistent with the standard ?CDM cosmological model with a probability-to-exceed of 0.38. We combine recent CMB E-mode measurements and make inferences about cosmological parameters in ?CDM as well as in extensions to ?CDM. 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- Mpc- 1 1. When allowing the number of relativistic species (Neff ) to vary, we find Neff = 2.94 ±0.16, which is in good agreement with the standard value of 3.046. Instead allowing the primordial helium abundance (YHe) to vary, the data favor YHe = 0.248 ±0.012. This is very close to the expectation of 0.2467 from big bang nucleosynthesis. When varying both YHe and Neff , we find Neff = 2.70 ±0.26 and YHe = 0.262 ±0.015.
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- Published
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- Published version
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Astrophysical JournalISSN
0004-637XPublisher
IOP PublishingExternal DOI
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1Volume
904Page range
1-13Article number
a65Department affiliated with
- Physics and Astronomy Publications
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- Yes
Legacy Posted Date
2021-01-08First Compliant Deposit (FCD) Date
2020-12-29Usage metrics
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