Details

Autor(en) / Beteiligte

• Somalwar, Jean J.
• Ravi, Vikram
• Dong, Dillon Z.
• Chen, Yuyang
• Breen, Shari
• Chandra, Poonam
• Clarke, Tracy
• De, Kishalay
• Gaensler, B. M.
• Hallinan, Gregg
• Laha, Sibasish
• Law, Casey
• Myers, Steven T.
• Parsotan, Tyler
• Peters, Wendy
• Polisensky, Emil

Titel

A Candidate Relativistic Tidal Disruption Event at 340 Mpc

Ist Teil von

• The Astrophysical journal, 2023-03, Vol.945 (2), p.142

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2023

Quelle

Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals

Beschreibungen/Notizen

• Abstract We present observations of an extreme radio flare, VT J024345.70-284040.08, hereafter VT J0243, from the nucleus of a galaxy with evidence for historic Seyfert activity at redshift z = 0.074. Between NRAO Very Large Array (VLA) Sky Survey observations in 1993 to VLA Sky Survey observations in 2018, VT J0243 rose from a ∼ GHz radio luminosity of ν L ν ≲ 10 38 erg s −1 to ν L ν ∼ 10 40 erg s −1 , and still continues to brighten. The radio spectral energy distribution evolution is consistent with a nascent jet that has slowed over ∼3000 days with an average 0.1 <〈 β 〉< 0.6. The jet is energetic (∼10 51–52 erg), and had a radius ∼0.7 pc in 2021 December. X-ray observations suggest a persistent or evolving corona, possibly associated with an accretion disk, and IR and optical observations constrain any high-energy counterpart to be sub-Eddington. VT J0243 may be an example of a young, off-axis radio jet from a slowly evolving tidal disruption event. Other more mysterious triggers for the accretion enhancement and jet launching are possible. In either case, VT J0243 is a unique example of a nascent jet, highlighting the unknown connection between supermassive black holes, the properties of their accretion flows, and jet launching.