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CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources

2023; IOP Publishing; Volume: 947; Issue: 2 Linguagem: Inglês

10.3847/1538-4357/acc6c1

1538-4357

The CHIME FRB Collaboration, Bridget C. Andersen, Kevin Bandura, Mohit Bhardwaj, P. J. Boyle, Charanjot Brar, Tomas Cassanelli, Shami Chatterjee, Pragya Chawla, Amanda M. Cook, Alice P. Curtin, M. Dobbs, Fengqiu Adam Dong, Jakob T. Faber, Mateus Fandino, Emmanuel Fonseca, B. M. Gaensler, Utkarsh Giri, Antonio Herrera-Martín, Alex S. Hill, Adaeze L. Ibik, Alexander Josephy, Jane Kaczmarek, Zarif Kader, V. M. Kaspi, T. L. Landecker, Adam Lanman, Mattias Lazda, Calvin Leung, Hsiu-Hsien Lin, Kiyoshi W. Masui, Ryan Mckinven, Juan Mena-Parra, Bradley W. Meyers, Daniele Michilli, Cherry Ng, Ayush Pandhi, Aaron B. Pearlman, Ue‐Li Pen, Emily Petroff, Ziggy Pleunis, Masoud Rafiei-Ravandi, Mubdi Rahman, S. M. Ransom, Andre Renard, Ketan R. Sand, Pranav Sanghavi, Paul Scholz, Vishwangi Shah, Kaitlyn Shin, Seth R. Siegel, Kendrick M. Smith, I. H. Stairs, Jianing Su, Shriharsh P. Tendulkar, K. Vanderlinde, Haochen Wang, Dallas Wulf, A. V. Zwaniga,

Astrophysics and Cosmic Phenomena

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 colocated on the sky having similar dispersion measures (DMs). The new repeaters have DMs ranging from ∼220 to ∼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 a 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 <?CDATA ${2.6}_{-2.6}^{+2.9}$?> 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.