Foreground-Immune Cosmic Microwave Background Lensing with Shear-Only Reconstruction

Schaan, Emmanuel; Ferraro, Simone

doi:10.1103/physrevlett.122.181301

Foreground-Immune Cosmic Microwave Background Lensing with Shear-Only Reconstruction

Journal Article · Wed May 08 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.122.181301· OSTI ID:1580403

Schaan, Emmanuel ^[1]; Ferraro, Simone ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Cosmic microwave background (CMB) lensing from current and upcoming wide-field CMB experiments such as AdvACT, SPT-3G and Simons Observatory relies heavily on temperature (versus polarization). In this regime, foreground contamination to the temperature map produces significant lensing biases, which cannot be fully controlled by multifrequency component separation, masking, or bias hardening. Here in this Letter, we split the standard CMB lensing quadratic estimator into a new set of optimal “multipole” estimators. On large scales, these multipole estimators reduce to the known magnification and shear estimators, and a new shear B-mode estimator. We leverage the different symmetries of the lensed CMB and extragalactic foregrounds to argue that the shear-only estimator should be approximately immune to extragalactic foregrounds. We build a new method to compute, separately and without noise, the primary, secondary, and trispectrum biases to CMB lensing from foreground simulations. Using this method, we demonstrate that the shear estimator is, indeed, insensitive to extragalactic foregrounds, even when applied to a single-frequency temperature map contaminated with cosmic infrared background, thermal Sunyaev-Zel’dovich, kinematic Sunyaev-Zel’dovich, and radio point sources. This dramatic reduction in foreground biases allows us to include higher temperature multipoles than with the standard quadratic estimator, thus, increasing the total lensing signal-to-noise ratio beyond the quadratic estimator. In addition, magnification-only and shear B-mode estimators provide useful diagnostics for potential residuals.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1580403

Alternate ID(s):: OSTI ID: 1511522
OSTI ID: 1527182

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 122; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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CMB lensing reconstruction biases in cross-correlation with large-scale structure probes Fabbian, Giulio; Lewis, Antony; Beck, Dominic Journal of Cosmology and Astroparticle Physics, Vol. 2019, Issue 10 https://doi.org/10.1088/1475-7516/2019/10/057	journal	October 2019
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Evidence for the Cross-correlation between Cosmic Microwave Background Polarization Lensing from Polarbear and Cosmic Shear from Subaru Hyper Suprime-Cam Namikawa, T.; Chinone, Y.; Miyatake, H. The Astrophysical Journal, Vol. 882, Issue 1 https://doi.org/10.3847/1538-4357/ab3424	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 Wu, W. L. K.; Mocanu, L. M.; Ade, P. A. R. The Astrophysical Journal, Vol. 884, Issue 1 https://doi.org/10.3847/1538-4357/ab4186	journal	October 2019
A Measurement of the Cosmic Microwave Background Lensing Potential and Power Spectrum from 500 deg$^2$ of SPTpol Temperature and Polarization Data Wu, W. L. K.; Mocanu, L. M.; Ade, P. A. R. arXiv https://doi.org/10.48550/arxiv.1905.05777	text	January 2019
Delensing Degree-Scale $B$-Mode Polarization with High-Redshift Line Intensity Mapping Karkare, Kirit S. arXiv https://doi.org/10.48550/arxiv.1908.08128	text	January 2019

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