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Faraday depolarization and induced circular polarization by multipath propagation with application to FRBs

Beniamini, Paz and Kumar, Pawan and Narayan, Ramesh (2022) Faraday depolarization and induced circular polarization by multipath propagation with application to FRBs. Monthly Notices of the Royal Astronomical Society, 510 (3). pp. 4654-4668. ISSN 0035-8711. doi:10.1093/mnras/stab3730. https://resolver.caltech.edu/CaltechAUTHORS:20220414-27799000

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Abstract

We describe how the observed polarization properties of an astronomical object are related to its intrinsic polarization properties and the finite temporal and spectral resolutions of the observing device. Moreover, we discuss the effect that a scattering screen, with non-zero magnetic field, between the source and observer has on the observed polarization properties. We show that the polarization properties are determined by the ratio of observing bandwidth and coherence bandwidth of the scattering screen and the ratio of temporal resolution of the instrument and the variability time of screen, as long as the length over which the Faraday rotation induced by the screen changes by ∼π is smaller than the size of the screen visible to the observer. We describe the conditions under which a source that is 100 per cent linearly polarized intrinsically might be observed as partially depolarized, and how the source’s temporal variability can be distinguished from the temporal variability induced by the scattering screen. In general, linearly polarized waves passing through a magnetized scattering screen can develop a significant circular polarization. We apply the work to the observed polarization properties of a few fast radio bursts (FRBs), and outline potential applications to pulsars.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stab3730DOIArticle
https://arxiv.org/abs/2110.00028arXivDiscussion Paper
ORCID:
AuthorORCID
Beniamini, Paz0000-0001-7833-1043
Narayan, Ramesh0000-0002-1919-2730
Alternate Title:Faraday depolarization and induced circular polarization by multi-path propagation with application to FRBs
Additional Information:© 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) Accepted 2021 December 17. Received 2021 December 7; in original form 2021 September 17. PB was supported by the Gordon and Betty Moore Foundation, Grant GBMF5076. This work has been funded in part by an NSF grant AST-2009619. DATA AVAILABILITY. The data produced in this study will be shared on reasonable request to the authors.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationGBMF5076
NSFAST-2009619
Subject Keywords:polarization –ISM: structure
Issue or Number:3
DOI:10.1093/mnras/stab3730
Record Number:CaltechAUTHORS:20220414-27799000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220414-27799000
Official Citation:Paz Beniamini, Pawan Kumar, Ramesh Narayan, Faraday depolarization and induced circular polarization by multipath propagation with application to FRBs, Monthly Notices of the Royal Astronomical Society, Volume 510, Issue 3, March 2022, Pages 4654–4668, https://doi.org/10.1093/mnras/stab3730
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114326
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:15 Apr 2022 15:09
Last Modified:15 Apr 2022 15:09

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