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Title: Bias to CMB lensing from lensed foregrounds

Abstract

Extragalactic foregrounds are known to constitute a limiting systematic in temperature-based cosmic microwave background (CMB) lensing with AdvACT, SPT-3G, Simons Observatory, and CMB S4. Furthermore, since these foregrounds are emitted at cosmological distances, they are also themselves lensed. The correlation between this foreground lensing and CMB lensing causes an additional bias in CMB lensing estimators. In this paper, we quantify for the first time this "lensed foreground bias" for the standard CMB lensing quadratic estimator, the CMB shear, and the CMB magnification estimators, in the case of Simons Observatory and in the absence of multifrequency component separation. This percent-level bias is highly significant in the cross-correlation of CMB lensing with LSST galaxies and comparable to the statistical uncertainty in the CMB lensing autospectrum. Finally, we discuss various mitigation strategies and show that "lensed foreground bias-hardening" methods can reduce this bias at some cost in signal to noise. The code used to generate our theory curves is publicly available.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Univ. of California, Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
OSTI Identifier:
1582354
Report Number(s):
arXiv:1908.08057v2
Journal ID: ISSN 2470-0010; PRVDAQ; ark:/13030/qt9sg530wq
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 12; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Mishra, Nishant, and Schaan, Emmanuel. Bias to CMB lensing from lensed foregrounds. United States: N. p., 2019. Web. doi:10.1103/physrevd.100.123504.
Mishra, Nishant, & Schaan, Emmanuel. Bias to CMB lensing from lensed foregrounds. United States. doi:10.1103/physrevd.100.123504.
Mishra, Nishant, and Schaan, Emmanuel. Tue . "Bias to CMB lensing from lensed foregrounds". United States. doi:10.1103/physrevd.100.123504.
@article{osti_1582354,
title = {Bias to CMB lensing from lensed foregrounds},
author = {Mishra, Nishant and Schaan, Emmanuel},
abstractNote = {Extragalactic foregrounds are known to constitute a limiting systematic in temperature-based cosmic microwave background (CMB) lensing with AdvACT, SPT-3G, Simons Observatory, and CMB S4. Furthermore, since these foregrounds are emitted at cosmological distances, they are also themselves lensed. The correlation between this foreground lensing and CMB lensing causes an additional bias in CMB lensing estimators. In this paper, we quantify for the first time this "lensed foreground bias" for the standard CMB lensing quadratic estimator, the CMB shear, and the CMB magnification estimators, in the case of Simons Observatory and in the absence of multifrequency component separation. This percent-level bias is highly significant in the cross-correlation of CMB lensing with LSST galaxies and comparable to the statistical uncertainty in the CMB lensing autospectrum. Finally, we discuss various mitigation strategies and show that "lensed foreground bias-hardening" methods can reduce this bias at some cost in signal to noise. The code used to generate our theory curves is publicly available.},
doi = {10.1103/physrevd.100.123504},
journal = {Physical Review D},
number = 12,
volume = 100,
place = {United States},
year = {2019},
month = {12}
}

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