A milliarcsecond localization associates FRB 20190417A with a compact persistent radio source and an extreme magneto-ionic environment
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arXiv
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| Natura: | Preprint |
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2025
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| author | Moroianu, Alexandra M. Bhandari, Shivani Drout, Maria R. Hessels, Jason W. T. Hewitt, Danté M. Kirsten, Franz Marcote, Benito Pleunis, Ziggy Snelders, Mark P. Sridhar, Navin Bach, Uwe Bempong-Manful, Emmanuel K. Bezrukovs, Vladislavs Blaauw, Richard Bray, Justin D. Buttaccio, Salvatore Chatterjee, Shami Corongiu, Alessandro Feiler, Roman Gaensler, B. M. Gawroński, Marcin P. Giroletti, Marcello Ibik, Adaeze L. Karuppusamy, Ramesh Lazda, Mattias Leung, Calvin Lindqvist, Michael Masui, Kiyoshi W. Michilli, Daniele Nimmo, Kenzie Ould-Boukattine, Omar S. Pandhi, Ayush Paragi, Zsolt Pearlman, Aaron B. Puchalska, Weronika Scholz, Paul Shin, Kaitlyn Sluman, Jurjen J. Trudu, Matteo Williams-Baldwin, David Yang, Jun |
| author_facet | Moroianu, Alexandra M. Bhandari, Shivani Drout, Maria R. Hessels, Jason W. T. Hewitt, Danté M. Kirsten, Franz Marcote, Benito Pleunis, Ziggy Snelders, Mark P. Sridhar, Navin Bach, Uwe Bempong-Manful, Emmanuel K. Bezrukovs, Vladislavs Blaauw, Richard Bray, Justin D. Buttaccio, Salvatore Chatterjee, Shami Corongiu, Alessandro Feiler, Roman Gaensler, B. M. Gawroński, Marcin P. Giroletti, Marcello Ibik, Adaeze L. Karuppusamy, Ramesh Lazda, Mattias Leung, Calvin Lindqvist, Michael Masui, Kiyoshi W. Michilli, Daniele Nimmo, Kenzie Ould-Boukattine, Omar S. Pandhi, Ayush Paragi, Zsolt Pearlman, Aaron B. Puchalska, Weronika Scholz, Paul Shin, Kaitlyn Sluman, Jurjen J. Trudu, Matteo Williams-Baldwin, David Yang, Jun |
| contents | We report the milliarcsecond localization of a high (1379 pc/cc) dispersion measure (DM) repeating fast radio burst, 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 FRBs 20121102A, 20190520B and 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 191(39) microJy 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) and +5061(24) rad/m2 over three years. 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/cc (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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_05174 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A milliarcsecond localization associates FRB 20190417A with a compact persistent radio source and an extreme magneto-ionic environment Moroianu, Alexandra M. Bhandari, Shivani Drout, Maria R. Hessels, Jason W. T. Hewitt, Danté M. Kirsten, Franz Marcote, Benito Pleunis, Ziggy Snelders, Mark P. Sridhar, Navin Bach, Uwe Bempong-Manful, Emmanuel K. Bezrukovs, Vladislavs Blaauw, Richard Bray, Justin D. Buttaccio, Salvatore Chatterjee, Shami Corongiu, Alessandro Feiler, Roman Gaensler, B. M. Gawroński, Marcin P. Giroletti, Marcello Ibik, Adaeze L. Karuppusamy, Ramesh Lazda, Mattias Leung, Calvin Lindqvist, Michael Masui, Kiyoshi W. Michilli, Daniele Nimmo, Kenzie Ould-Boukattine, Omar S. Pandhi, Ayush Paragi, Zsolt Pearlman, Aaron B. Puchalska, Weronika Scholz, Paul Shin, Kaitlyn Sluman, Jurjen J. Trudu, Matteo Williams-Baldwin, David Yang, Jun High Energy Astrophysical Phenomena We report the milliarcsecond localization of a high (1379 pc/cc) dispersion measure (DM) repeating fast radio burst, 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 FRBs 20121102A, 20190520B and 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 191(39) microJy 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) and +5061(24) rad/m2 over three years. 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/cc (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. |
| title | A milliarcsecond localization associates FRB 20190417A with a compact persistent radio source and an extreme magneto-ionic environment |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2509.05174 |