AT2018hyz
| Event type | Tidal disruption event |
|---|---|
| Constellation | Sextans |
| Right ascension | 10h 06m 50.871s |
| Declination | +01° 34′ 34.08″[1] |
| Distance | 665 million light years (204 Mpc)[1] |
| Redshift | 0.04573[1] |
| Host | 2MASS J10065085+0141342 |
AT2018hyz is a tidal disruption event (TDE) that was discovered in 2018 by the All Sky Automated Survey for SuperNovae (ASASS-SN).[1]
History
[edit]In 2022, astronomers announced the discovery of radio emission from AT2018hyz using the Very Large Array (VLA), MeerKAT, and the Australia Telescope Compact Array (ATCA), despite no radio emission detected earlier.[2] The emission is still rising rapidly, and has been interpreted as an outflow of material that was "burped" several years after the initial TDE from the accretion disk of the supermassive black hole, traveling at up to half the speed of light.[3] Alternately, it has been proposed that the delayed radio emission from AT2018hyz could be due to an off-axis astrophysical jet, which launched promptly when the black hole was consumed (similar to the TDE Swift J1644+57), and emission only became visible later when it entered our line of sight.[4]
Host galaxy
[edit]The host galaxy for AT2018hyz is 2MASS J10065085+0141342, known as LEDA 3119592 or 2dFGRS TGN421Z052, located at redshift z = 0.04573.[5] It is classified as a dormant post starburst galaxy or a type E+A galaxy.[6] Based on studies, the host galaxy's redshift has a g-band visual magnitude of -20.2, with the galaxy containing a low-mass black hole measuring 106 M⊙.[6]
See also
[edit]References
[edit]- ^ a b c d "AT 2018hyz | Transient Name Server". www.wis-tns.org.
- ^ Cendes, Y.; Berger, E.; Alexander, K. D.; Gomez, S.; Hajela, A.; Chornock, R.; Laskar, T.; Margutti, R.; Metzger, B.; Bietenholz, M. F.; Brethauer, D.; Wieringa, M. H. (1 October 2022). "A Mildly Relativistic Outflow Launched Two Years after Disruption in Tidal Disruption Event AT2018hyz". The Astrophysical Journal. 938 (1): 28. arXiv:2206.14297. Bibcode:2022ApJ...938...28C. doi:10.3847/1538-4357/ac88d0.
- ^ "'We've Never Seen Anything Like This Before:' Black Hole Spews Out Material Years After Shredding Star | Center for Astrophysics | Harvard & Smithsonian". www.cfa.harvard.edu. Retrieved 7 May 2024.
- ^ Matsumoto, Tatsuya; Piran, Tsvi (2 May 2023). "Generalized equipartition method from an arbitrary viewing angle". Monthly Notices of the Royal Astronomical Society. 522 (3): 4565–4576. arXiv:2211.10051. doi:10.1093/mnras/stad1269.
- ^ Gomez, Sebastian; Nicholl, Matt; Short, Philip; Margutti, Raffaella; Alexander, Kate D; Blanchard, Peter K; Berger, Edo; Eftekhari, Tarraneh; Schulze, Steve; Anderson, Joseph; Arcavi, Iair; Chornock, Ryan; Cowperthwaite, Philip S; Galbany, Lluís; Herzog, Laura J (2020-07-20). "The Tidal Disruption Event AT 2018hyz II: Light-curve modelling of a partially disrupted star". Monthly Notices of the Royal Astronomical Society. 497 (2): 1925–1934. arXiv:2003.05469. doi:10.1093/mnras/staa2099. ISSN 0035-8711.
- ^ a b Short, P; Nicholl, M; Lawrence, A; Gomez, S; Arcavi, I; Wevers, T; Leloudas, G; Schulze, S; Anderson, J P; Berger, E; Blanchard, P K; Burke, J; Segura, N Castro; Charalampopoulos, P; Chornock, R (2020-09-02). "The tidal disruption event AT 2018hyz – I. Double-peaked emission lines and a flat Balmer decrement". Monthly Notices of the Royal Astronomical Society. 498 (3): 4119–4133. arXiv:2003.05470. doi:10.1093/mnras/staa2065. ISSN 0035-8711.
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