Stellar prospects for FRB gravitational lensing
- Creators
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Connor, Liam
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Ravi, Vikram
Abstract
Gravitational lensing of fast radio bursts (FRBs) offers an exciting avenue for several cosmological applications. However, it is not yet clear how many such events future surveys will detect nor how to optimally find them. We use the known properties of FRBs to forecast detection rates of gravitational lensing on delay time-scales from microseconds to years, corresponding to lens masses spanning 15 orders of magnitude. We highlight the role of the FRB redshift distribution on our ability to observe gravitational lensing. We consider cosmological lensing of FRBs by stars in foreground galaxies and show that strong stellar lensing will dominate on microsecond time-scales. Upcoming surveys such as DSA-2000 and CHORD will constrain the fraction of dark matter in compact objects (e.g. primordial black holes) and may detect millilensing events from intermediate mass black holes (IMBHs) or small dark matter halos. Coherent all-sky monitors will be able to detect longer-duration lensing events from massive galaxies, in addition to short time-scale lensing. Finally, we propose a new application of FRB gravitational lensing that will measure directly the circumgalactic medium of intervening galaxies.
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 thank Sterl Phinney and Minghao Yue for valuable insights on strong lensing. We also thank Matt Dobbs, Keith Vanderlinde, Zarif Kader, Calvin Leung, and Ue-Li Pen for helpful discussions on coherent gravitational lensing. Data Availability: This work was based on publicly available data and can be reproduced with the Jupyter notebook found in https://github.com/liamconnor/frb-grav-lensing.Attached Files
Published - stad667.pdf
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Additional details
- Eprint ID
- 121822
- Resolver ID
- CaltechAUTHORS:20230613-731854300.62
- Created
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2023-06-20Created from EPrint's datestamp field
- Updated
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2023-06-20Created from EPrint's last_modified field
- Caltech groups
- Astronomy Department