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Implications of Canadian Hydrogen Intensity Mapping Experiment repeating fast radio bursts

Lu, Wenbin and Piro, Anthony L. and Waxman, Eli (2020) Implications of Canadian Hydrogen Intensity Mapping Experiment repeating fast radio bursts. Monthly Notices of the Royal Astronomical Society, 498 (2). pp. 1973-1982. ISSN 0035-8711. doi:10.1093/mnras/staa2397.

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CHIME has now detected 18 repeating fast radio bursts (FRBs). We explore what can be learned about the energy distribution and activity level of the repeaters by fitting realistic FRB population models to the data. For a power-law energy distribution dN/dE ∝ E^(−γ) for the repeating bursts, there is a critical index γcrit that controls whether the dispersion measure (DM, a proxy for source distance) distribution of repeaters is bottom or top-heavy. We find γ_(crit) = 7/4 for Poisson wait-time distribution of repeaters in Euclidean space and further demonstrate how it is affected by temporal clustering of repetitions and cosmological effects. It is especially interesting that two of the CHIME repeaters (FRB 181017 and 190417) have large DM∼10³pc cm⁻³⁠. These can be understood if: (i) the energy distribution is shallow γ = 1.7^(+0.3)_(−0.1) 68 per cent confidence) or (ii) a small fraction of sources are extremely active. In the second scenario, these two high-DM sources should be repeating more than 100 times more frequently than FRB 121102 and the energy index is constrained to be γ = 1.9^(+0.3)_(−0.2) (⁠68 per cent confidence). In either case, this γ is consistent with the energy dependence of the non-repeating ASKAP sample, which suggests that they are drawn from the same population. Finally, our model predicts how the CHIME repeating fraction should decrease with redshift and this can be compared with observations to infer the distribution of activity level in the whole population.

Item Type:Article
Related URLs:
URLURL TypeDescription
Lu, Wenbin0000-0002-1568-7461
Piro, Anthony L.0000-0001-6806-0673
Waxman, Eli0000-0002-9038-5877
Additional Information:© 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2020 July 27. Received 2020 July 10; in original form 2020 March 24. Published: 31 August 2020. We thank Paz Beniamini for useful discussions. We thank the organizers for the 2019 Toronto FRB Day workshop and the 2020 Flatiron Institute FRB workshop, where the current work was initiated. WL is supported by the David and Ellen Lee Fellowship at Caltech. Data Availability: The data underlying this article will be shared on reasonable request to the corresponding author.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
David and Lucile Packard FoundationUNSPECIFIED
David and Ellen Lee Postdoctoral ScholarshipUNSPECIFIED
Subject Keywords:methods: statistical – fast radio bursts
Issue or Number:2
Record Number:CaltechAUTHORS:20201214-085718623
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Official Citation:Wenbin Lu, Anthony L Piro, Eli Waxman, Implications of Canadian Hydrogen Intensity Mapping Experiment repeating fast radio bursts, Monthly Notices of the Royal Astronomical Society, Volume 498, Issue 2, October 2020, Pages 1973–1982,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107057
Deposited By: Tony Diaz
Deposited On:14 Dec 2020 20:56
Last Modified:16 Nov 2021 18:59

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