Impact and mitigation of polarized extragalactic foregrounds on Bayesian cosmic microwave background lensing

Qu, Frank J.; Millea, Marius; Schaan, Emmanuel

doi:10.1103/physrevd.111.023503

Title: Impact and mitigation of polarized extragalactic foregrounds on Bayesian cosmic microwave background lensing

Journal Article · 05 January 2025 · Physical Review D

DOI: https://doi.org/10.1103/physrevd.111.023503 · OSTI ID:2496846

Qu, Frank J. ^[1]; Millea, Marius ^[2]; Schaan, Emmanuel ^[3]

Univ. of Cambridge (United Kingdom); Kavli Institute for Cosmology Cambridge (United Kingdom); Stanford Univ., CA (United States). Kavli Institute for Particle Astrophysics & Cosmology
Univ. of California, Davis, CA (United States)
Stanford Univ., CA (United States). Kavli Institute for Particle Astrophysics & Cosmology; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Future low-noise cosmic microwave background (CMB) lensing measurements from e.g., CMB-S4 will be polarization dominated, rather than temperature dominated. In this new regime, statistically optimal lensing reconstructions outperform the standard quadratic estimator, but their sensitivity to extragalactic polarized foregrounds has not been quantified. Using realistic simulations of polarized radio and infrared point sources, we show for the first time that optimal Bayesian lensing from a CMB-S4-like experiment is insensitive to the expected level of polarized extragalactic foregrounds after masking, as long as an accurate foreground power spectrum is included in the analysis. For more futuristic experiments where these foregrounds could cause a detectable bias, we propose a new method to jointly fit for lensing and the Poisson foregrounds, generalizing the bias hardening from the standard quadratic estimator to Bayesian lensing.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2496846

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 2 Vol. 111; ISSN 2470-0010; ISSN 2470-0029

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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