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CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources

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arxiv 2301.08762 v2 pith:5U2PX4UW submitted 2023-01-20 astro-ph.HE

CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources

The CHIME/FRB Collaboration: Bridget C. Andersen , Kevin Bandura , Mohit Bhardwaj , P. J. Boyle , Charanjot Brar , Tomas Cassanelli , S. Chatterjee , Pragya Chawla
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Amanda M. Cook Alice P. Curtin Matt Dobbs Fengqiu Adam Dong Jakob T. Faber Mateus Fandino Emmanuel Fonseca B. M. Gaensler Utkarsh Giri Antonio Herrera-Martin Alex S. Hill Adaeze Ibik Alexander Josephy Jane F. Kaczmarek Zarif Kader Victoria Kaspi T. L. Landecker Adam E. Lanman Mattias Lazda Calvin Leung Hsiu-Hsien Lin Kiyoshi W. Masui Ryan Mckinven Juan Mena-Parra Bradley W. Meyers D. Michilli Cherry Ng Ayush Pandhi Aaron B. Pearlman Ue-Li Pen Emily Petroff Ziggy Pleunis Masoud Rafiei-Ravandi Mubdi Rahman Scott M. Ransom Andre Renard Ketan R. Sand Pranav Sanghavi Paul Scholz Vishwangi Shah Kaitlyn Shin Seth Siegel Kendrick Smith Ingrid Stairs Jianing Su Shriharsh P. Tendulkar Keith Vanderlinde Haochen Wang Dallas Wulf Andrew Zwaniga
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We present the discovery of 25 new repeating fast radio burst (FRB) sources found among CHIME/FRB events detected between 2019 September 30 and 2021 May 1. The sources were found using a new clustering algorithm that looks for multiple events co-located on the sky having similar dispersion measures (DMs). The new repeaters have DMs ranging from $\sim$220 pc cm$^{-3}$ to $\sim$1700 pc cm$^{-3}$, and include sources having exhibited as few as two bursts to as many as twelve. We report a statistically significant difference in both the DM and extragalactic DM (eDM) distributions between repeating and apparently nonrepeating sources, with repeaters having lower mean DM and eDM, and we discuss the implications. We find no clear bimodality between the repetition rates of repeaters and upper limits on repetition from apparently nonrepeating sources after correcting for sensitivity and exposure effects, although some active repeating sources stand out as anomalous. We measure the repeater fraction over time and find that it tends to an equilibrium of $2.6_{-2.6}^{+2.9}$% over our total time-on-sky thus far. We also report on 14 more sources which are promising repeating FRB candidates and which merit follow-up observations for confirmation.

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