A Milliarcsecond Localization Associates FRB 20190417A with a Compact Persistent Radio Source and an Extreme Magnetoionic Environment
Artikel i vetenskaplig tidskrift, 2026
We report the milliarcsecond localization of a high (similar to 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 the PRS to <23 pc and yields an integrated flux density of 190 +/- 40 mu Jy at 1.4 GHz. Though we do not find significant evidence for DM evolution, FRB 20190417A exhibits a time-variable rotation measure (RM) ranging between +3958 +/- 11 rad m(-2) and +5061 +/- 24 rad m(-2) over a 50-day period. We find no evidence for intervening galaxy clusters in the FRB's line of sight and place a conservative lower limit on the rest-frame host DM contribution of 1228 pc cm(-3) (90% confidence)-the largest known for any FRB so far. This system strengthens the emerging picture of a rare subclass of repeating FRBs with large and variable RMs, above-average host DMs, and luminous PRS counterparts in metal-poor dwarf galaxies. Our results suggest that these systems are the result of environmental selection, or a distinct engine for FRB emission.
Författare
Alexandra M. Moroianu
Universiteit Van Amsterdam
Shivani Bhandari
Commonwealth Scientific and Industrial Research Organisation (CSIRO)
Maria R. Drout
University of Toronto
Jason W. T. Hessels
Netherlands Institute for Radio Astronomy (ASTRON)
Universiteit Van Amsterdam
McGill University
Dante M. Hewitt
Universiteit Van Amsterdam
Franz Kirsten
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
Benito Marcote
Netherlands Institute for Radio Astronomy (ASTRON)
Joint Institute for VLBI in Europe (JIVE)
Ziggy Pleunis
Netherlands Institute for Radio Astronomy (ASTRON)
Universiteit Van Amsterdam
Mark P. Snelders
Netherlands Institute for Radio Astronomy (ASTRON)
Universiteit Van Amsterdam
Navin Sridhar
Stanford University
Uwe Bach
Max-Planck-Gesellschaft
Emmanuel K. Bempong-Manful
University of Bristol
University of Manchester
Vladislavs Bezrukovs
Ventspils University of Applied Sciences
Richard Blaauw
Netherlands Institute for Radio Astronomy (ASTRON)
Justin D. Bray
University of Manchester
Salvatore Buttaccio
Istituto nazionale di astrofisica (INAF)
Shami Chatterjee
Cornell University
Alessandro Corongiu
Istituto nazionale di astrofisica (INAF)
Roman Feiler
Uniwersytet Mikolaja Kopernika
B. M. Gaensler
University of Toronto
University of California
Marcin P. Gawronski
Uniwersytet Mikolaja Kopernika
Marcello Giroletti
Istituto nazionale di astrofisica (INAF)
Adaeze L. Ibik
University of Toronto
Ramesh Karuppusamy
Max-Planck-Gesellschaft
Mattias Lazda
University of Toronto
Calvin Leung
University of California
Michael Lindqvist
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
Kiyoshi W. Masui
Massachusetts Institute of Technology (MIT)
Daniele Michilli
Aix-Marseille Université
Kenzie Nimmo
Massachusetts Institute of Technology (MIT)
Omar S. Ould-Boukattine
Netherlands Institute for Radio Astronomy (ASTRON)
Universiteit Van Amsterdam
Ayush Pandhi
University of Toronto
Zsolt Paragi
Joint Institute for VLBI in Europe (JIVE)
Aaron B. Pearlman
McGill University
Weronika Puchalska
Uniwersytet Mikolaja Kopernika
Paul Scholz
University of Toronto
York University
Kaitlyn Shin
California Institute of Technology (Caltech)
Jurjen J. Sluman
Netherlands Institute for Radio Astronomy (ASTRON)
Matteo Trudu
Istituto nazionale di astrofisica (INAF)
David Williams-Baldwin
University of Manchester
Jun Yang
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
Astrophysical Journal Letters
2041-8205 (ISSN) 2041-8213 (eISSN)
Vol. 996 1 L16Onsala rymdobservatorium infrastruktur
Vetenskapsrådet (VR) (2017-00648), 2018-01-01 -- 2021-12-31.
Ämneskategorier (SSIF 2025)
Astronomi, astrofysik och kosmologi
Meteorologi och atmosfärsvetenskap
DOI
10.3847/2041-8213/ae28c7