AT 2018hyz

AT2018hyz
Event typeTidal disruption event
ConstellationSextans
Right ascension10h 06m 50.871s
Declination+01° 41′ 34.08″
Distance665 million light years (204 Mpc)
Redshift0.04573
Host2MASS J10065085+0141342
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AT2018hyz is a tidal disruption event (TDE) that was discovered in 2018 by the All Sky Automated Survey for SuperNovae (ASASS-SN).

History

In 2022, astronomers announced the discovery of radio emission from AT2018hyz using the Australian SKA Pathfinder (ASKAP) telescope . Additional detections using the Very Large Array (VLA), MeerKAT, and the Australia Telescope Compact Array (ATCA) were published soon afterwards. The emission is still rising rapidly, and was initially 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. Alternatively, it has been proposed that the delayed radio emission from AT2018hyz could be explained by an off-axis astrophysical jet, which launched promptly when the black hole consumed material (similar to the TDE Swift J1644+57), and radio emission only became visible later when it entered our line of sight.

Host galaxy

The host galaxy for AT2018hyz is 2MASS J10065085+0141342, known as LEDA 3119592 or 2dFGRS TGN421Z052, located at redshift z = 0.04573. It is classified as a dormant post starburst galaxy or a type E+A galaxy. 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☉.

See also

References

  1. 1 2 3 4 "AT 2018hyz | Transient Name Server". www.wis-tns.org.
  2. ↑ Horesh, A.; Burger, N.; Sfaradi, I.; Gaensler, B.; Murphy, T.; Leung, J.; O'Brien, A.; Kaplan, D.L. (2 April 2022). "Late-time radio detection of the TDE AT2018hyz by the VAST (ASKAP) project". The Astronomer's Telegram (#15307).
  3. ↑ 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.
  4. ↑ "'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.
  5. ↑ Sfaradi, Itai; Beniamini, Paz; Horesh, Assaf; Piran, Tsvi; Bright, Joe; Rhodes, Lauren; Williams, David R. A.; Fender, Rob; Leung, James K.; Murphy, Tara; Green, Dave A. (January 2024). "An off-axis relativistic jet seen in the long lasting delayed radio flare of the TDE AT 2018hyz". Monthly Notices of the Royal Astronomical Society. 527 (3): 7672–7680. arXiv:2308.01965. doi:10.1093/mnras/stad3717.
  6. ↑ 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.
  7. ↑ 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.
  8. 1 2 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.