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CMB Polarization B-mode Delensing with SPTpol and Herschel

Manzotti, A. and Bock, J. J. and Crites, A. T. and Padin, S. (2017) CMB Polarization B-mode Delensing with SPTpol and Herschel. Astrophysical Journal, 846 (1). Art. No. 45. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20170830-101242847

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Abstract

We present a demonstration of delensing the observed cosmic microwave background (CMB) B-mode polarization anisotropy. This process of reducing the gravitational-lensing-generated B-mode component will become increasingly important for improving searches for the B modes produced by primordial gravitational waves. In this work, we delens B-mode maps constructed from multi-frequency SPTpol observations of a 90 deg^2 patch of sky by subtracting a B-mode template constructed from two inputs: SPTpol E-mode maps and a lensing potential map estimated from the Herschel 500 μm map of the cosmic infrared background. We find that our delensing procedure reduces the measured B-mode power spectrum by 28% in the multipole range 300 < ℓ < 2300; this is shown to be consistent with expectations from simulations and to be robust against systematics. The null hypothesis of no delensing is rejected at 6.9σ. Furthermore, we build and use a suite of realistic simulations to study the general properties of the delensing process and find that the delensing efficiency achieved in this work is limited primarily by the noise in the lensing potential map. We demonstrate the importance of including realistic experimental non-idealities in the delensing forecasts used to inform instrument and survey-strategy planning of upcoming lower-noise experiments, such as CMB-S4.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/aa82bbDOIArticle
http://iopscience.iop.org/article/10.3847/1538-4357/aa82bb/metaPublisherArticle
https://arxiv.org/abs/1701.04396arXivDiscussion Paper
ORCID:
AuthorORCID
Manzotti, A.0000-0003-0057-877X
Additional Information:© 2017 The American Astronomical Society. Received 2017 January 21; revised 2017 June 30; accepted 2017 July 25; published 2017 August 30. The South Pole Telescope program is supported by the National Science Foundation through grant PLR-1248097. Partial support is also provided by the NSF Physics Frontier Center grant PHY-0114422 to the Kavli Institute of Cosmological Physics at the University of Chicago, the Kavli Foundation, and the Gordon and Betty Moore Foundation through Grant GBMF#947 to the University of Chicago. Work at Argonne National Lab is supported by UChicago Argonne, LLC, Operator of Argonne National Laboratory (Argonne). Argonne, a U.S. Department of Energy Office of Science Laboratory, is operated under Contract No. DE-AC02-06CH11357. We also acknowledge support from the Argonne Center for Nanoscale Materials. The McGill authors acknowledge funding from the Natural Sciences and Engineering Research Council of Canada, Canadian Institute for Advanced Research, and Canada Research Chairs program. This work is also supported by the U.S. Department of Energy. The CU Boulder group acknowledges support from NSF AST-0956135. BB is supported by the Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the U.S. Department of Energy. C.R. acknowledges support from a Australian Research Councils Future Fellowship (FT150100074). W.L.K.W. is grateful for support from the Croucher Foundation and hospitality of Stanford University. J.W.H. is supported by the National Science Foundation under Award No. AST-1402161. The data analysis pipeline uses the scientific python stack (Jones et al. 2001; Hunter 2007; van der Walt et al. 2011) and the HDF5 file format (The HDF Group 1997). The authors acknowledge useful discussions with Blake Sherwin and Toshiya Namikawa and use of code first written by Duncan Hanson.
Funders:
Funding AgencyGrant Number
NSFPLR-1248097
NSFPHY-0114422
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore Foundation947
Department of Energy (DOE)DE-AC02-06CH11357
Argonne Center for Nanoscale MaterialsUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canadian Institute for Advanced Research (CIFAR)UNSPECIFIED
Canada Research Chairs ProgramUNSPECIFIED
NSFAST-0956135
Department of Energy (DOE)DE-AC02-07CH11359
Australian Research CouncilFT150100074
Croucher FoundationUNSPECIFIED
NSFAST-1402161
Subject Keywords:cosmic background radiation; cosmology: observations; early universe; inflation
Issue or Number:1
Record Number:CaltechAUTHORS:20170830-101242847
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170830-101242847
Official Citation:A. Manzotti et al 2017 ApJ 846 45
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80951
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Aug 2017 17:33
Last Modified:03 Oct 2019 18:36

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