Plasma lensing with magnetic field and a small correction to the Faraday rotation measurement
- Creators
- Er, Xinzhong
- Pen, Ue-Li
- Sun, Xiaohui
- Li, Dongzi
Abstract
Plasma lensing displays interesting characteristics that set it apart from gravitational lensing. The magnetized medium induces birefringence in the two polarization modes. As the lensing deflection grows stronger, e.g. when images form near the critical curve, the geometric delay of the signal can cause rotation in linear polarization, in addition to Faraday rotation. This rotation has a frequency dependence to the power of four. We study the geometric rotation of the lensed image in a Gaussian density model and find that it is necessary to take into account the geometric rotation when estimating magnetized media, especially in the underdense lens. At frequencies of ∼1 GHz or lower, the geometric rotation can dominate. We simulate the flux of lensed images and find that when the image forms near the lensing critical curve, the birefringence can convert the linear polarization and un-polarization pulse into a circular mode. The lensing magnification has the potential to increase the probability of detecting such events.
Additional Information
© 2023 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) We would like to thank the referee for a high evaluation of our work and suggestions that improved the clarity of our manuscript. XE is supported by the NSFC grant numbers 11873006 and 11933002, and the China Manned Space Project with numbers CMS-CSST-2021-A01, CMS-CSST-2021-A07, and CMS-CSST-2021-A12. XS is supported by the National SKA program of China (2022SKA0120101). DATA AVAILABILITY. The data underlying this article will be shared on reasonable request to the corresponding author.Attached Files
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Additional details
- Eprint ID
- 122269
- Resolver ID
- CaltechAUTHORS:20230714-263898400.6
- 11873006
- National Natural Science Foundation of China
- 11933002
- National Natural Science Foundation of China
- CMS-CSST-2021-A01
- China Manned Space Project
- CMS-CSST-2021-A07
- China Manned Space Project
- CMS-CSST-2021-A12
- China Manned Space Project
- 2022SKA0120101
- National SKA program of China
- Created
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2023-07-17Created from EPrint's datestamp field
- Updated
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2023-10-20Created from EPrint's last_modified field
- Caltech groups
- TAPIR, Walter Burke Institute for Theoretical Physics