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Planck intermediate results: XLI. A map of lensing-induced B -modes

Ade, P A R ; Aghanim, N ; Ashdown, M ; Aumont, J ; Baccigalupi, C ; Banday, A J ; Barreiro, R B ; Bartolo, N ; Basak, S ; Battaner, E

Astronomy and astrophysics (Berlin), 2016-12, Vol.596, p.A102 [Periódico revisado por pares]

United States: EDP Sciences

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  • Título:
    Planck intermediate results: XLI. A map of lensing-induced B -modes
  • Autor: Ade, P A R ; Aghanim, N ; Ashdown, M ; Aumont, J ; Baccigalupi, C ; Banday, A J ; Barreiro, R B ; Bartolo, N ; Basak, S ; Battaner, E
  • Assuntos: Algorithms ; Arrays ; ASTRONOMY AND ASTROPHYSICS ; Astrophysics ; cosmic background radiation ; Cosmic microwave background ; Cosmology and Extra-Galactic Astrophysics ; cosmology observations ; Extraction ; Gravitational lenses ; gravitational lensing: weak ; Polarization ; Reconstruction ; Sciences of the Universe ; Searching ; weak gravitational lensing
  • É parte de: Astronomy and astrophysics (Berlin), 2016-12, Vol.596, p.A102
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    AC02-05CH11231
    USDOE Office of Science (SC)
  • Descrição: The secondary cosmic microwave background (CMB) B-modes stem from the post-decoupling distortion of the polarization E-modes due to the gravitational lensing effect of large-scale structures. These lensing-induced B-modes constitute both a valuable probe of the dark matter distribution and an important contaminant for the extraction of the primary CMB B-modes from inflation. Planck provides accurate nearly all-sky measurements of both the polarization E-modes and the integrated mass distribution via the reconstruction of the CMB lensing potential. By combining these two data products, we have produced an all-sky template map of the lensing-induced B-modes using a real-space algorithm that minimizes the impact of sky masks. The cross-correlation of this template with an observed (primordial and secondary) B-mode map can be used to measure the lensing B-mode power spectrum at multipoles up to 2000. In particular, when cross-correlating with the B-mode contribution directly derived from the Planck polarization maps, we obtain lensing-induced B-mode power spectrum measurement at a significance level of 12[sigma], which agrees with the theoretical expectation derived from the Planck best-fit [Lambda] cold dark matter model. This unique nearly all-sky secondary B-mode template, which includes the lensing-induced information from intermediate to small (10 [< or =] [scriptl][< or =] 1000) angular scales, is delivered as part of the Planck 2015 public data release. It will be particularly useful for experiments searching for primordial B-modes, such as BICEP2/Keck Array or LiteBIRD, since it will enable an estimate to be made of the lensing-induced contribution to the measured total CMB B-modes.
  • Editor: United States: EDP Sciences
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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