AT2019azh: An unusually long-lived, radio-bright thermal tidal disruption event
Tidal disruption events (TDEs) occur when a star is destroyed by a supermassive black hole at the centre of a galaxy, temporarily increasing the accretion rate on to the black hole and producing a bright flare across the electromagnetic spectrum. Radio observations of TDEs trace outflows and jets th...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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OXFORD UNIV PRESS
2022
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/DP200102471 http://hdl.handle.net/20.500.11937/90025 |
| _version_ | 1848765313180499968 |
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| author | Goodwin, A.J. Van Velzen, S. Miller-Jones, James Mummery, A. Bietenholz, M.F. Wederfoort, A. Hammerstein, E. Bonnerot, C. Hoffmann, J. Yan, L. |
| author_facet | Goodwin, A.J. Van Velzen, S. Miller-Jones, James Mummery, A. Bietenholz, M.F. Wederfoort, A. Hammerstein, E. Bonnerot, C. Hoffmann, J. Yan, L. |
| author_sort | Goodwin, A.J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Tidal disruption events (TDEs) occur when a star is destroyed by a supermassive black hole at the centre of a galaxy, temporarily increasing the accretion rate on to 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 2 yr of comprehensive, multiradio frequency monitoring observations of the TDE AT2019azh taken with the Very Large Array and MeerKAT radio telescopes from approximately 10 d pre-optical peak to 810 d post-optical peak. AT2019azh shows unusual radio emission for a thermal TDE, as it brightened very slowly over 2 yr, and showed fluctuations in the synchrotron energy index of the optically thin synchrotron emission from 450 d 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 on to the supermassive black hole. This data set provides a significant contribution to the observational data base of outflows from TDEs, including the earliest radio detection of a non-relativistic TDE to date, relative to the optical discovery. |
| first_indexed | 2025-11-14T11:33:16Z |
| format | Journal Article |
| id | curtin-20.500.11937-90025 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:33:16Z |
| publishDate | 2022 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-900252023-02-07T07:19:02Z AT2019azh: An unusually long-lived, radio-bright thermal tidal disruption event Goodwin, A.J. Van Velzen, S. Miller-Jones, James Mummery, A. Bietenholz, M.F. Wederfoort, A. Hammerstein, E. Bonnerot, C. Hoffmann, J. Yan, L. Science & Technology Physical Sciences Astronomy & Astrophysics radio continuum: transients transients: tidal disruption events X-RAY BLACK-HOLE DISC FORMATION STAR JET CANDIDATE EMISSION FLARES MULTIWAVELENGTH OUTBURST Tidal disruption events (TDEs) occur when a star is destroyed by a supermassive black hole at the centre of a galaxy, temporarily increasing the accretion rate on to 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 2 yr of comprehensive, multiradio frequency monitoring observations of the TDE AT2019azh taken with the Very Large Array and MeerKAT radio telescopes from approximately 10 d pre-optical peak to 810 d post-optical peak. AT2019azh shows unusual radio emission for a thermal TDE, as it brightened very slowly over 2 yr, and showed fluctuations in the synchrotron energy index of the optically thin synchrotron emission from 450 d 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 on to the supermassive black hole. This data set provides a significant contribution to the observational data base of outflows from TDEs, including the earliest radio detection of a non-relativistic TDE to date, relative to the optical discovery. 2022 Journal Article http://hdl.handle.net/20.500.11937/90025 10.1093/mnras/stac333 English http://purl.org/au-research/grants/arc/DP200102471 http://creativecommons.org/licenses/by/4.0/ OXFORD UNIV PRESS fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics radio continuum: transients transients: tidal disruption events X-RAY BLACK-HOLE DISC FORMATION STAR JET CANDIDATE EMISSION FLARES MULTIWAVELENGTH OUTBURST Goodwin, A.J. Van Velzen, S. Miller-Jones, James Mummery, A. Bietenholz, M.F. Wederfoort, A. Hammerstein, E. Bonnerot, C. Hoffmann, J. Yan, L. AT2019azh: An unusually long-lived, radio-bright thermal tidal disruption event |
| title | AT2019azh: An unusually long-lived, radio-bright thermal tidal disruption event |
| title_full | AT2019azh: An unusually long-lived, radio-bright thermal tidal disruption event |
| title_fullStr | AT2019azh: An unusually long-lived, radio-bright thermal tidal disruption event |
| title_full_unstemmed | AT2019azh: An unusually long-lived, radio-bright thermal tidal disruption event |
| title_short | AT2019azh: An unusually long-lived, radio-bright thermal tidal disruption event |
| title_sort | at2019azh: an unusually long-lived, radio-bright thermal tidal disruption event |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics radio continuum: transients transients: tidal disruption events X-RAY BLACK-HOLE DISC FORMATION STAR JET CANDIDATE EMISSION FLARES MULTIWAVELENGTH OUTBURST |
| url | http://purl.org/au-research/grants/arc/DP200102471 http://hdl.handle.net/20.500.11937/90025 |