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A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data

Ade, P. A. R.
•
Aguilar, M.
•
Akiba, Y.
altro
Zahn, A.
2017
  • journal article

Periodico
THE ASTROPHYSICAL JOURNAL
Abstract
We report an improved measurement of the cosmic microwave background B-mode polarization power spectrum with the Polarbear experiment at 150 GHz. By adding new data collected during the second season of observations (2013-2014) to re-analyzed data from the first season (2012-2013), we have reduced twofold the band-power uncertainties. The band powers are reported over angular multipoles 500 â ¤ â â ¤ 2100, where the dominant B-mode signal is expected to be due to the gravitational lensing of E-modes. We reject the null hypothesis of no B-mode polarization at a confidence of 3.1Ï including both statistical and systematic uncertainties. We test the consistency of the measured B-modes with the Î Cold Dark Matter (Î CDM) framework by fitting for a single lensing amplitude parameter AL= 0.60 +0.26-0.24(stat)+0.00-0.04(inst) ± 0.14(foreground) ± 0.04(multi), where AL= 1 relative to the Planck 2015 best-fit model prediction. We obtain ±0.14(foreground) ±0.04(multi), where is the fiducial Î CDM value.
DOI
10.3847/1538-4357/aa8e9f
WOS
WOS:000413525700003
Archivio
http://hdl.handle.net/20.500.11767/69567
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85032796298
http://iopscience.iop.org/article/10.3847/1538-4357/aa8e9f/pdf
https://arxiv.org/abs/1705.02907
Diritti
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Soggetti
  • cosmic background rad...

  • cosmology: observatio...

  • large-scale structure...

  • astro-ph.CO

  • astro-ph.CO

  • Astronomy and Astroph...

  • Space and Planetary S...

  • Settore FIS/05 - Astr...

Web of Science© citazioni
70
Data di acquisizione
Mar 28, 2024
Visualizzazioni
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Data di acquisizione
Apr 19, 2024
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