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- W4284975737 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 VLA Sky Survey observations in 1993 to VLA Sky Survey observations in 2018, VT J0243 rose from a ${sim}$GHz radio luminosity of $nu L_nu lesssim 10^{38}$ erg s$^{-1}$ to $nu L_nu{sim}10^{40}$ erg s$^{-1}$, and still continues to brighten. The radio spectral energy distribution (SED) evolution is consistent with a nascent jet that has slowed over ${sim}3000$ days with an average $0.1 < langle beta rangle < 0.6$. The jet is energetic (${sim}10^{51-52}$ erg), and had a radius ${sim}0.7$ pc in Dec. 2021. 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." @default.
- W4284975737 created "2022-07-10" @default.
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- W4284975737 date "2022-07-06" @default.
- W4284975737 modified "2023-10-18" @default.
- W4284975737 title "A candidate relativistic tidal disruption event at 340 Mpc" @default.
- W4284975737 doi "https://doi.org/10.48550/arxiv.2207.02873" @default.
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