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A Steadily Declining Dispersion Measure for the Repeating Fast Radio Burst FRB 20220529A: Evidence for a Fast Radio Burst Engine Embedded in an Expanding Supernova Remnant

  • Authors: Ayush Pandhi, Kenzie Nimmo, Shion Andrew, Charanjot Brar, Shami Chatterjee, Amanda M. Cook, Alice Curtin, B. M. Gaensler, Marcin Gawronski, Jason Hessels, Victoria M. Kaspi, Afrokk Khan, Franz Kirsten, Mattias Lazda, Calvin Leung, Robert Main, Kiyoshi W. Masui, Ryan Mckinven, Daniele Michilli, Mason Ng, Omar Ould-Boukattine, Aaron B. Pearlman, Ziggy Pleunis, Alexander W. Pollak, Sachin Pradeep E. T., Weronika Puchalska, Mawson W. Sammons, Paul Scholz, Vishwangi Shah, Kaitlyn Shin, Seth R. Siegel, Kendrick Smith

Ayush Pandhi et al 2026 The Astrophysical Journal Letters 1000 .

  • Provider: AAS Journals

Caption: Figure 6.

(Left) Rest-frame scatter in the observed RM, σRM,host, plotted as a function of median ∣RMhost∣ for FRB 20220529A and for other FRBs from the literature. (Right) Median rest-frame scattering timescale referenced to 600 MHz, where available, vs. σRM,host for the same FRBs. Gold and blue shaded regions represent the 68% confidence interval around the median ∣RMhost∣ and τ for FRB 20220529A and other repeaters, respectively. Uncertainties on σRM,host are smaller than the markers. The test statistics and p-values from Pearson R tests in both cases are presented in the bottom right of each panel.

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