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Title: The impact of light polarization effects on weak lensing systematics

Abstract

ABSTRACT A fraction of the light observed from edge-on disc galaxies is polarized due to two physical effects: selective extinction by dust grains aligned with the magnetic field and scattering of the anisotropic starlight field. Since the reflection and transmission coefficients of the reflecting and refracting surfaces in an optical system depend on the polarization of incoming rays, this optical polarization produces both (a) a selection bias in favour of galaxies with specific orientations and (b) a polarization-dependent point spread function (PSF). In this work, we build toy models to obtain for the first time an estimate for the impact of polarization on PSF shapes and the impact of the selection bias due to the polarization effect on the measurement of the ellipticity used in shear measurements. In particular, we are interested in determining if this effect will be significant for Wide-Field Infrared Survey Telescope (WFIRST). We show that the systematic uncertainties in the ellipticity components are 8 × 10−5 and 1.1 × 10−4 due to the selection bias and PSF errors respectively. Compared to the overall requirements on knowledge of the WFIRST PSF ellipticity (4.7 × 10−4 per component), both of these systematic uncertainties are sufficiently close to the WFIRST tolerance level that more detailedmore » studies of the polarization effects or more stringent requirements on polarization-sensitive instrumentation for WFIRST are required.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [3]
  1. McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA
  2. Department of Physics, University of California Santa Barbara, Santa Barbara, CA 93106, USA
  3. Center for Cosmology and Astroparticle Physics, The Ohio State University, Columbus, OH 43210, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1633678
Grant/Contract Number:  
SC0019083
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 496 Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Lin, Chien-Hao, Tan, Brent, Mandelbaum, Rachel, and Hirata, Christopher M. The impact of light polarization effects on weak lensing systematics. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa1298.
Lin, Chien-Hao, Tan, Brent, Mandelbaum, Rachel, & Hirata, Christopher M. The impact of light polarization effects on weak lensing systematics. United Kingdom. doi:https://doi.org/10.1093/mnras/staa1298
Lin, Chien-Hao, Tan, Brent, Mandelbaum, Rachel, and Hirata, Christopher M. Tue . "The impact of light polarization effects on weak lensing systematics". United Kingdom. doi:https://doi.org/10.1093/mnras/staa1298.
@article{osti_1633678,
title = {The impact of light polarization effects on weak lensing systematics},
author = {Lin, Chien-Hao and Tan, Brent and Mandelbaum, Rachel and Hirata, Christopher M.},
abstractNote = {ABSTRACT A fraction of the light observed from edge-on disc galaxies is polarized due to two physical effects: selective extinction by dust grains aligned with the magnetic field and scattering of the anisotropic starlight field. Since the reflection and transmission coefficients of the reflecting and refracting surfaces in an optical system depend on the polarization of incoming rays, this optical polarization produces both (a) a selection bias in favour of galaxies with specific orientations and (b) a polarization-dependent point spread function (PSF). In this work, we build toy models to obtain for the first time an estimate for the impact of polarization on PSF shapes and the impact of the selection bias due to the polarization effect on the measurement of the ellipticity used in shear measurements. In particular, we are interested in determining if this effect will be significant for Wide-Field Infrared Survey Telescope (WFIRST). We show that the systematic uncertainties in the ellipticity components are 8 × 10−5 and 1.1 × 10−4 due to the selection bias and PSF errors respectively. Compared to the overall requirements on knowledge of the WFIRST PSF ellipticity (4.7 × 10−4 per component), both of these systematic uncertainties are sufficiently close to the WFIRST tolerance level that more detailed studies of the polarization effects or more stringent requirements on polarization-sensitive instrumentation for WFIRST are required.},
doi = {10.1093/mnras/staa1298},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 496,
place = {United Kingdom},
year = {2020},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
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DOI: https://doi.org/10.1093/mnras/staa1298

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