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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 4.

FRB 20220529A sky position as measured by the CHIME/FRB Outriggers in this work (white), corresponding to the combined localization of bursts 12 and 16, compared to the position reported by the VLA (green; Y. Li et al. 2026). Solid and dashed ellipses represent the 1σ and 3σ localization uncertainties, respectively. The localization ellipses are overplotted on an archival Dark Energy Camera Legacy Survey gri-filter image of the field. The faint host galaxy identified by Y. Li et al. (2026) can be seen consistent with both localization ellipses.

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