학술논문
Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Side-Lobe FRBs
Document Type
Working Paper
Author
Lin, Hsiu-Hsien; Scholz, Paul; Ng, Cherry; Pen, Ue-Li; Bhardwaj, Mohit; Chawla, Pragya; Curtin, Alice P.; Li, Dongzi; Newburgh, Laura; Reda, Alex; Sand, Ketan R.; Tendulkar, Shriharsh P.; Andersen, Bridget; Bandura, Kevin; Brar, Charanjot; Cassanelli, Tomas; Cook, Amanda M.; Dobbs, Matt; Dong, Fengqiu Adam; Eadie, Gwendolyn; Fonseca, Emmanuel; Gaensler, Bryan M.; Giri, Utkarsh; Herrera-Martin, Antonio; Hill, Alex S.; Kaczmarek, Jane; Kania, Joseph; Kaspi, Victoria; Khairy, Kholoud; Lanman, Adam E.; Leung, Calvin; Masui, Kiyoshi W.; Mena-Parra, Juan; Meyers, Bradley W.; Michilli, Daniele; Milutinovic, Nikola; Ordog, Anna; Pearlman, Aaron B.; Pleunis, Ziggy; Rafiei-Ravandi, Masoud; Rahman, Mubdi; Ransom, Scott; Sanghavi, Pranav; Shin, Kaitlyn; Smith, Kendrick; Stairs, Ingrid; Stenning, David C.; Vanderlinde, Keith; Wulf, Dallas
Source
Subject
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Abstract
We report ten fast radio bursts (FRBs) detected in the far side-lobe region (i.e., $\geq 5^\circ$ 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$_{\rm cc}$ < 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 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.
Comment: 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
Comment: 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