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Title: CMB Polarization B-mode Delensing with SPTpol and Herschel

Journal Article · · Astrophysical Journal
; ; ; ; ; ; ; ; ;  [1];  [2]; ;  [3]; ; ;  [4];  [5];  [6];  [7];
  1. Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
  2. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305 (United States)
  3. Department of Physics, University of California, Berkeley, CA 94720 (United States)
  4. NIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO 80305 (United States)
  5. California Institute of Technology, MS 367-17, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
  6. School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Durban (South Africa)
  7. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025 (United States)

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{sup 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.

OSTI ID:
22875862
Journal Information:
Astrophysical Journal, Vol. 846, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
Country of Publication:
United States
Language:
English

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SPT-3G: A Multichroic Receiver for the South Pole Telescope journal July 2018
Performance of Al–Mn Transition-Edge Sensor Bolometers in SPT-3G journal November 2019
Stochastic gravitational wave backgrounds journal November 2018
The Simons Observatory: science goals and forecasts journal February 2019
CMB lensing reconstruction biases in cross-correlation with large-scale structure probes journal October 2019
Detection and removal of B-mode dust foregrounds with signatures of statistical anisotropy journal July 2018
Optimal and fast $\mathcal {E}/\mathcal {B}$ separation with a dual messenger field journal February 2018
Is patchy reionization an obstacle in detecting the primordial gravitational wave signal? journal April 2019
Delensing degree-scale B -mode polarization with high-redshift line intensity mapping journal August 2019
Bias to CMB lensing from lensed foregrounds journal December 2019
Optimal constraints on primordial gravitational waves from the lensed CMB journal February 2019
Year two instrument status of the SPT-3G cosmic microwave background receiver
  • Carter, Faustin W.; Cecil, Thomas W.; Chang, Clarence L.
  • Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX https://doi.org/10.1117/12.2312426
conference August 2018
Measurements of the Temperature and E-mode Polarization of the CMB from 500 Square Degrees of SPTpol Data journal January 2018
Large-scale Maps of the Cosmic Infrared Background from Planck journal September 2019
A Measurement of the Cosmic Microwave Background Lensing Potential and Power Spectrum from 500 deg 2 of SPTpol Temperature and Polarization Data journal October 2019
Constraints on Cosmological Parameters from the 500 deg 2 SPTPOL Lensing Power Spectrum journal January 2020
Predictions of Cosmic Microwave Background Foreground Dust Polarization Using Velocity Gradients journal January 2020
The Simons Observatory: Science goals and forecasts text January 2019
Measurements of the Temperature and E-Mode Polarization of the CMB from 500 Square Degrees of SPTpol Data text January 2017
Detection and Removal of B-mode Dust Foregrounds with Signatures of Statistical Anisotropy text January 2018
The Simons Observatory: Science goals and forecasts text January 2018
Is patchy reionization an obstacle in detecting the primordial gravitational wave signal? text January 2019
A Measurement of the Cosmic Microwave Background Lensing Potential and Power Spectrum from 500 deg$^2$ of SPTpol Temperature and Polarization Data text January 2019
Performance of Al-Mn Transition-Edge Sensor Bolometers in SPT-3G text January 2019
Delensing Degree-Scale $B$-Mode Polarization with High-Redshift Line Intensity Mapping text January 2019
Constraints on Cosmological Parameters from the 500 deg$^2$ SPTpol Lensing Power Spectrum text January 2019
Maximum a posteriori CMB lensing reconstruction journal September 2017
Optimal constraints on primordial gravitational waves from the lensed CMB text January 2018