Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Side-Lobe FRBs
Abstract
We report ten fast radio bursts (FRBs) detected in the far side-lobe region (i.e., off-meridian) of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) from 2018 August 28 to 2021 August 31. We localize the bursts by fitting their spectra with a model of the CHIME/FRB synthesized beam response. We find that the far side-lobe events have on average ~500 times greater fluxes than events detected in CHIME's main lobe. We show that the side-lobe sample is therefore statistically ~20 times closer than the main-lobe sample. We find promising host galaxy candidates (P < 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 side-lobe FRBs in a total exposure time of 35580 hours. Under the assumption of Poisson-distributed bursts, we infer that the mean repetition interval above the detection threshold of the far side-lobe events is longer than 11880 hours, which is at least 2380 times larger than the interval from known CHIME/FRB detected repeating sources, with some caveats, notably that very narrow-band events could have been missed. Our results from these far side-lobe 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 subpopulation, or (2) non-repeating FRBs are a distinct population different from known repeaters.
Keywords
Cite
@article{arxiv.2307.05261,
title = {Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Side-Lobe FRBs},
author = {Hsiu-Hsien Lin and Paul Scholz and Cherry Ng and Ue-Li Pen and Mohit Bhardwaj and Pragya Chawla and Alice P. Curtin and Dongzi Li and Laura Newburgh and Alex Reda and Ketan R. Sand and Shriharsh P. Tendulkar and Bridget Andersen and Kevin Bandura and Charanjot Brar and Tomas Cassanelli and Amanda M. Cook and Matt Dobbs and Fengqiu Adam Dong and Gwendolyn Eadie and Emmanuel Fonseca and Bryan M. Gaensler and Utkarsh Giri and Antonio Herrera-Martin and Alex S. Hill and Jane Kaczmarek and Joseph Kania and Victoria Kaspi and Kholoud Khairy and Adam E. Lanman and Calvin Leung and Kiyoshi W. Masui and Juan Mena-Parra and Bradley W. Meyers and Daniele Michilli and Nikola Milutinovic and Anna Ordog and Aaron B. Pearlman and Ziggy Pleunis and Masoud Rafiei-Ravandi and Mubdi Rahman and Scott Ransom and Pranav Sanghavi and Kaitlyn Shin and Kendrick Smith and Ingrid Stairs and David C. Stenning and Keith Vanderlinde and Dallas Wulf},
journal= {arXiv preprint arXiv:2307.05261},
year = {2024}
}
Comments
27 pages, 20 figures. This version is the result of the merger of arxiv:2307.05262 and the previous version of this paper. Accepted for publication in ApJ