CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources
Abstract
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 220 pc cm to 1700 pc cm, 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 % 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.
Keywords
Cite
@article{arxiv.2301.08762,
title = {CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources},
author = {FRB Collaboration and Bridget C. Andersen and Kevin Bandura and Mohit Bhardwaj and P. J. Boyle and Charanjot Brar and Tomas Cassanelli and S. Chatterjee and Pragya Chawla and Amanda M. Cook and Alice P. Curtin and Matt Dobbs and Fengqiu Adam Dong and Jakob T. Faber and Mateus Fandino and Emmanuel Fonseca and B. M. Gaensler and Utkarsh Giri and Antonio Herrera-Martin and Alex S. Hill and Adaeze Ibik and Alexander Josephy and Jane F. Kaczmarek and Zarif Kader and Victoria Kaspi and T. L. Landecker and Adam E. Lanman and Mattias Lazda and Calvin Leung and Hsiu-Hsien Lin and Kiyoshi W. Masui and Ryan Mckinven and Juan Mena-Parra and Bradley W. Meyers and D. Michilli and Cherry Ng and Ayush Pandhi and Aaron B. Pearlman and Ue-Li Pen and Emily Petroff and Ziggy Pleunis and Masoud Rafiei-Ravandi and Mubdi Rahman and Scott M. Ransom and Andre Renard and Ketan R. Sand and Pranav Sanghavi and Paul Scholz and Vishwangi Shah and Kaitlyn Shin and Seth Siegel and Kendrick Smith and Ingrid Stairs and Jianing Su and Shriharsh P. Tendulkar and Keith Vanderlinde and Haochen Wang and Dallas Wulf and Andrew Zwaniga},
journal= {arXiv preprint arXiv:2301.08762},
year = {2023}
}
Comments
ApJ in press. Comments are still welcome and follow-up observations are encouraged!