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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 1.

Total intensity dynamic spectra, dedispersed to their best-fit DMs, for the 16 FRB 20220529A bursts with baseband data detected by CHIME/FRB. All dynamic spectra have a frequency resolution of 390.625 kHz and have been downsampled to a common time resolution of 163.84 μs to ensure a sufficient S/N in fainter bursts. Frequency-averaged total intensity (black) and linearly polarized intensity (red) profiles are plotted above the dynamic spectra. Individual burst components are highlighted by shaded regions (in chronological order for multiple components: red, blue, purple, yellow, and green) overlaid on the intensity profiles. Channels masked out due to radio frequency interference are highlighted in red on the left of the dynamic spectra.

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