A Milliarcsecond Localization Associates FRB 20190417A with a Compact Persistent Radio Source and an Extreme Magnetoionic Environment
Alexandra Moroianu; Shivani Bhandari; Maria R. Drout; Jason W. T. Hessels; D. M. Hewitt; Franz Kirsten; B. Marcote; Ziggy Pleunis · 2025 · The Astrophysical Journal Letters
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Abstract
Abstract We report the milliarcsecond localization of a high (∼1379 pc cm −3 ) dispersion measure (DM) repeating fast radio burst (FRB), FRB 20190417A. Combining European VLBI Network detections of five repeat bursts, we confirm the FRB’s host to be a low-metallicity, star-forming dwarf galaxy at z = 0.12817, similar to the hosts of FRB 20121102A, FRB 20190520B, and FRB 20240114A. We also confirm that it is associated with a previously reported persistent radio source (PRS), which is compact on milliarcsecond scales. Visibility-domain model fitting constrains the transverse physical size of th
Abstract by Alexandra Moroianu; Shivani Bhandari; Maria R. Drout; Jason W. T. Hessels; D. M. Hewitt; Franz Kirsten; B. Marcote; Ziggy Pleunis, The Astrophysical Journal Letters (2025) — licensed CC BY 4.0.
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Metadata source: OpenAlex · DOI 10.3847/2041-8213/ae28c7