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A measurement of the degree-scale CMB B-mode angular power spectrum with POLARBEAR

journal contribution
posted on 2023-06-20, 14:15 authored by S Adachi, M A O Aguilar Faúndez, K Arnold, C Baccigalupi, D Barron, D Beck, S Beckman, F Bianchini, D Boettger, J Borrill, Julien Carron, S Chapman, K Cheung, Y Chinone, Giulio Fabbian, The POLARBEAR Collaboration, others
We present a measurement of the B-mode polarization power spectrum of the cosmic microwave background (CMB) using data taken from 2014 July to 2016 December with the Polarbear experiment. The CMB power spectra are measured using observations at 150 GHz with an instantaneous array sensitivity of NETarray=23µ Kvs on a 670 square degree patch of sky centered at (R.A., decl.) = (+0h12m0s, -59°18'). A continuously rotating half-wave plate is used to modulate polarization and to suppress low-frequency noise. We achieve 32 µK arcmin effective polarization map noise with a knee in sensitivity of l = 90, where the inflationary gravitational-wave signal is expected to peak. The measured B-mode power spectrum is consistent with a ?CDM lensing and single dust component foreground model over a range of multipoles 50 = l = 600. The data disfavor zero ClBB at 2.2s using this l range of Polarbear data alone. We cross-correlate our data with Planck full mission 143, 217, and 353 GHz frequency maps and find the low-l B-mode power in the combined data set to be consistent with thermal dust emission. We place an upper limit on the tensor-to-scalar ratio r < 0.90 at the 95% confidence level after marginalizing over foregrounds.

History

Publication status

  • Published

File Version

  • Published version

Journal

Astrophysical Journal

ISSN

0004-637X

Publisher

IOP Publishing

Issue

1

Volume

897

Page range

1-23

Article number

a55

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2021-01-08

First Compliant Deposit (FCD) Date

2020-12-29

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