Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Sidelobe FRBs

Abstract We report 10 fast radio bursts (FRBs) detected in the far sidelobe region (i.e., ≥5° off-meridian) of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) from August 28 2018 to August 31 2021. We localize the bursts by fitting their spectra with a model of the CHIME/FRB synthesized beam response. We find that the far sidelobe events have on average ∼500 times greater fluxes than events detected in CHIME’s main lobe. We show that the sidelobe sample is therefore statistically ∼20 times closer than the main lobe sample. We find promising host galaxy candidates ( P cc < 1%) for two of the FRBs, 20190112B and 20210310B, at distances of 38 and 16 Mpc, respectively. CHIME/FRB did not observe repetition of similar brightness from the uniform sample of 10 sidelobe FRBs in a total exposure time of 35,580 hr. Under the assumption of Poisson-distributed bursts, we infer that the mean repetition interval above the detection threshold of the far sidelobe events is longer than 11,880 hr, which is at least 2380 times larger than the interval from known CHIME/FRB detected repeating sources, with some caveats, notably that very narrowband events could have been missed. Our results from these far sidelobe events suggest one of two scenarios: either (1) all FRBs repeat and the repetition intervals span a wide range, with high-rate repeaters being a rare sub-population, or (2) non-repeating FRBs are a distinct population different from known repeaters.

Authors

Publication Details

Journal
The Astrophysical Journal
Published
2024-10-25
DOI
https://doi.org/10.3847/1538-4357/ad779d
Citations
10
Primary Topic
Pulsars and Gravitational Waves Research
Type
article
Field-Weighted Citation Impact
3.32

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Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Sidelobe FRBs

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Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Sidelobe FRBs

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article en
10 citations

Abstract

Abstract We report 10 fast radio bursts (FRBs) detected in the far sidelobe region (i.e., ≥5° off-meridian) of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) from August 28 2018 to August 31 2021. We localize the bursts by fitting their spectra with a model of the CHIME/FRB synthesized beam response. We find that the far sidelobe events have on average ∼500 times greater fluxes than events detected in CHIME’s main lobe. We show that the sidelobe sample is therefore statistically ∼20 times closer than the main lobe sample. We find promising host galaxy candidates ( P cc < 1%) for two of the FRBs, 20190112B and 20210310B, at distances of 38 and 16 Mpc, respectively. CHIME/FRB did not observe repetition of similar brightness from the uniform sample of 10 sidelobe FRBs in a total exposure time of 35,580 hr. Under the assumption of Poisson-distributed bursts, we infer that the mean repetition interval above the detection threshold of the far sidelobe events is longer than 11,880 hr, which is at least 2380 times larger than the interval from known CHIME/FRB detected repeating sources, with some caveats, notably that very narrowband events could have been missed. Our results from these far sidelobe events suggest one of two scenarios: either (1) all FRBs repeat and the repetition intervals span a wide range, with high-rate repeaters being a rare sub-population, or (2) non-repeating FRBs are a distinct population different from known repeaters.

The Astrophysical JournalVol. 975(1)
National Science Foundation, U.S. Department of Defense, Alexander von Humboldt-Stiftung, Canadian Institute for Advanced Research, McGill University, Ontario Centres of Excellence, Government of Ontario, Government of Canada, Canada Research Chairs, Canada Foundation for Innovation, National Natural Science Foundation of China, Industry Canada, University of Toronto, Mitacs, Institut Périmètre de physique théorique, Smithsonian Astrophysical Observatory, National Defense Science and Engineering Graduate, McGill Space Institute, Natural Sciences and Engineering Research Council of Canada, National Research Council Canada, Fonds de recherche du Québec – Nature et technologies
Openalex Percentile: Top 8%
Pulsars and Gravitational Waves Research
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