An Ejection Event Captured by Very Long Baseline Interferometry during the Outburst of Swift J1727.8–1613
We observed a newly discovered Galactic black hole X-ray binary Swift J1727.8–1613 with the European VLBI Network (EVN) at 5 GHz. The observation was conducted immediately following a radio quenching event detected by the Karl G. Jansky Very Large Array. The visibility amplitude evolution over time...
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2025-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/ade0ab |
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| author | Hongmin Cao Jun Yang Sándor Frey Callan M. Wood James C. A. Miller-Jones Krisztina É. Gabányi Giulia Migliori Marcello Giroletti Lang Cui Tao An Xiaoyu Hong WeiHua Wang |
| author_facet | Hongmin Cao Jun Yang Sándor Frey Callan M. Wood James C. A. Miller-Jones Krisztina É. Gabányi Giulia Migliori Marcello Giroletti Lang Cui Tao An Xiaoyu Hong WeiHua Wang |
| author_sort | Hongmin Cao |
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| description | We observed a newly discovered Galactic black hole X-ray binary Swift J1727.8–1613 with the European VLBI Network (EVN) at 5 GHz. The observation was conducted immediately following a radio quenching event detected by the Karl G. Jansky Very Large Array. The visibility amplitude evolution over time reveals a large-amplitude radio flare and is consistent with an ejection event. The data can be interpreted either as a stationary component (i.e., the radio core) and a moving blob, or as two blobs moving away from the core symmetrically in opposite directions. The initial angular separation speed of the two components was estimated to 30 mas day ^−1 . We respectively fitted a single circular Gaussian model component to each of 14 sliced visibility data sets. For the case of including only European baselines, during the final hour of the EVN observation, the fitted sizes exhibited linear expansion, indicating that the measured sizes were dominated by the angular separation of the two components. The 6 hr EVN observation took place in a rising phase of an even larger 4 day long radio flare, implying that the ejection events were quite frequent and therefore continuous radio monitoring is necessary to correctly estimate the power of the transient jet. Combined with X-ray monitoring data, the radio quenching and subsequent flares/ejections were likely driven by instabilities in the inner hot accretion disk. |
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| id | doaj-art-3880bd8c8d27447ba8e812b2d3c5cb98 |
| institution | OA Journals |
| issn | 2041-8205 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal Letters |
| spelling | doaj-art-3880bd8c8d27447ba8e812b2d3c5cb982025-08-20T02:22:04ZengIOP PublishingThe Astrophysical Journal Letters2041-82052025-01-019871L1410.3847/2041-8213/ade0abAn Ejection Event Captured by Very Long Baseline Interferometry during the Outburst of Swift J1727.8–1613Hongmin Cao0https://orcid.org/0000-0003-1514-881XJun Yang1https://orcid.org/0000-0002-2322-5232Sándor Frey2https://orcid.org/0000-0003-3079-1889Callan M. Wood3https://orcid.org/0000-0002-2758-0864James C. A. Miller-Jones4https://orcid.org/0000-0003-3124-2814Krisztina É. Gabányi5https://orcid.org/0000-0003-1020-1597Giulia Migliori6https://orcid.org/0000-0003-0216-8053Marcello Giroletti7https://orcid.org/0000-0002-8657-8852Lang Cui8https://orcid.org/0000-0003-0721-5509Tao An9https://orcid.org/0000-0003-4341-0029Xiaoyu Hong10https://orcid.org/0000-0002-1992-5260WeiHua Wang11https://orcid.org/0000-0002-9909-3758School of Electronic and Electrical Engineering, Shangqiu Normal University , 298 Wenhua Road, Shangqiu, Henan 476000, People’s Republic of China ; hongmin.cao@foxmail.comDepartment of Space, Earth and Environment, Chalmers University of Technology , Onsala Space Observatory, 43992 Onsala, SwedenKonkoly Observatory , HUN-REN Research Centre for Astronomy and Earth Sciences, Konkoly Thege Miklós út 15-17, 1121 Budapest, Hungary; CSFK , MTA Centre of Excellence, Konkoly Thege Miklós út 15-17, 1121 Budapest, Hungary; Institute of Physics and Astronomy, ELTE Eötvös Loránd University , Pázmány Péter sétány 1/A, 1117 Budapest, HungaryInternational Centre for Radio Astronomy Research, Curtin University , GPO Box U1987, Perth, WA 6845, AustraliaInternational Centre for Radio Astronomy Research, Curtin University , GPO Box U1987, Perth, WA 6845, AustraliaKonkoly Observatory , HUN-REN Research Centre for Astronomy and Earth Sciences, Konkoly Thege Miklós út 15-17, 1121 Budapest, Hungary; CSFK , MTA Centre of Excellence, Konkoly Thege Miklós út 15-17, 1121 Budapest, Hungary; Department of Astronomy, Institute of Physics and Astronomy, ELTE Eötvös Loránd University , Pázmány Péter sétány 1/A, 1117 Budapest, Hungary; HUN-REN–ELTE Extragalactic Astrophysics Research Group, ELTE Eötvös Loránd University , Pázmány Péter sétány 1/A, 1117 Budapest, Hungary; Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University , Grudzia̧dzka 5, 87-100 Toruń, PolandINAF—Istituto di Radioastronomia , Via Gobetti 101, 40129 Bologna, ItalyINAF—Istituto di Radioastronomia , Via Gobetti 101, 40129 Bologna, ItalyXinjiang Astronomical Observatory, Chinese Academy of Sciences , 150 Science 1-Street, Urumqi, Xinjiang 830011, People’s Republic of ChinaShanghai Astronomical Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030, People’s Republic of ChinaShanghai Astronomical Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030, People’s Republic of ChinaSchool of Computer Information Engineering, Changzhou Institute of Technology , Changzhou 213032, People’s Republic of ChinaWe observed a newly discovered Galactic black hole X-ray binary Swift J1727.8–1613 with the European VLBI Network (EVN) at 5 GHz. The observation was conducted immediately following a radio quenching event detected by the Karl G. Jansky Very Large Array. The visibility amplitude evolution over time reveals a large-amplitude radio flare and is consistent with an ejection event. The data can be interpreted either as a stationary component (i.e., the radio core) and a moving blob, or as two blobs moving away from the core symmetrically in opposite directions. The initial angular separation speed of the two components was estimated to 30 mas day ^−1 . We respectively fitted a single circular Gaussian model component to each of 14 sliced visibility data sets. For the case of including only European baselines, during the final hour of the EVN observation, the fitted sizes exhibited linear expansion, indicating that the measured sizes were dominated by the angular separation of the two components. The 6 hr EVN observation took place in a rising phase of an even larger 4 day long radio flare, implying that the ejection events were quite frequent and therefore continuous radio monitoring is necessary to correctly estimate the power of the transient jet. Combined with X-ray monitoring data, the radio quenching and subsequent flares/ejections were likely driven by instabilities in the inner hot accretion disk.https://doi.org/10.3847/2041-8213/ade0abLow-mass x-ray binary starsJetsRadio continuum emissionVery long baseline interferometryX-ray photometry |
| spellingShingle | Hongmin Cao Jun Yang Sándor Frey Callan M. Wood James C. A. Miller-Jones Krisztina É. Gabányi Giulia Migliori Marcello Giroletti Lang Cui Tao An Xiaoyu Hong WeiHua Wang An Ejection Event Captured by Very Long Baseline Interferometry during the Outburst of Swift J1727.8–1613 The Astrophysical Journal Letters Low-mass x-ray binary stars Jets Radio continuum emission Very long baseline interferometry X-ray photometry |
| title | An Ejection Event Captured by Very Long Baseline Interferometry during the Outburst of Swift J1727.8–1613 |
| title_full | An Ejection Event Captured by Very Long Baseline Interferometry during the Outburst of Swift J1727.8–1613 |
| title_fullStr | An Ejection Event Captured by Very Long Baseline Interferometry during the Outburst of Swift J1727.8–1613 |
| title_full_unstemmed | An Ejection Event Captured by Very Long Baseline Interferometry during the Outburst of Swift J1727.8–1613 |
| title_short | An Ejection Event Captured by Very Long Baseline Interferometry during the Outburst of Swift J1727.8–1613 |
| title_sort | ejection event captured by very long baseline interferometry during the outburst of swift j1727 8 1613 |
| topic | Low-mass x-ray binary stars Jets Radio continuum emission Very long baseline interferometry X-ray photometry |
| url | https://doi.org/10.3847/2041-8213/ade0ab |
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