AT2019azh: an unusually long-lived, radio-bright thermal tidal disruption event
| Autor: | A J Goodwin, S van Velzen, J C A Miller-Jones, A Mummery, M F Bietenholz, A Wederfoort, E Hammerstein, C Bonnerot, J Hoffmann, L Yan |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
DISC FORMATION STAR Radio Continuum: Transients Astrophysics::High Energy Astrophysical Phenomena CANDIDATE FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Transients: Tidal Disruption Events MULTIWAVELENGTH transients [radio continuum] Space and Planetary Science JET BLACK-HOLE FLARES X-RAY Astrophysics::Solar and Stellar Astrophysics tidal disruption events [transients] OUTBURST EMISSION Astrophysics - High Energy Astrophysical Phenomena Astrophysics::Galaxy Astrophysics |
| Zdroj: | Goodwin, A J, van Velzen, S, Miller-Jones, J C A, Mummery, A, Bietenholz, M F, Wederfoort, A, Hammerstein, E, Bonnerot, C, Hoffmann, J & Yan, L 2022, ' AT2019azh : an unusually long-lived, radio-bright thermal tidal disruption event ', Monthly Notices of the Royal Astronomical Society, vol. 511, no. 4, pp. 5328-5345 . https://doi.org/10.1093/mnras/stac333 Monthly Notices of the Royal Astronomical Society, 511(4), 5328-5345 MNRAS |
| DOI: | 10.1093/mnras/stac333 |
| Popis: | Tidal disruption events (TDEs) occur when a star is destroyed by a supermassive black hole at the center of a galaxy, temporarily increasing the accretion rate onto the black hole and producing a bright flare across the electromagnetic spectrum. Radio observations of TDEs trace outflows and jets that may be produced. Radio detections of the outflows from TDEs are uncommon, with only about one third of TDEs discovered to date having published radio detections. Here we present over two years of comprehensive, multi-radio frequency monitoring observations of the tidal disruption event AT2019azh taken with the Very Large Array (VLA) and MeerKAT radio telescopes from approximately 10 days pre-optical peak to 810 days post-optical peak. AT2019azh shows unusual radio emission for a thermal TDE, as it brightened very slowly over two years, and showed fluctuations in the synchrotron energy index of the optically thin synchrotron emission from 450 days post-disruption. Based on the radio properties, we deduce that the outflow in this event is likely non-relativistic and could be explained by a spherical outflow arising from self-stream intersections, or a mildly collimated outflow from accretion onto the supermassive black hole. This data-set provides a significant contribution to the observational database of outflows from TDEs, including the earliest radio detection of a non-relativistic TDE to date, relative to the optical discovery. 17 pages, 8 figures. Submitted to MNRAS. Comments welcome! |
| Databáze: | OpenAIRE |
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