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Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654

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  • Sibasish Laha
  • Eileen T. Meyer
  • Dev R. Sadaula
  • Ritesh Ghosh
  • Dhrubojyoti Sengupta
  • Megan Masterson
  • Onic I. Shuvo
  • Matteo Guainazzi
  • Claudio Ricci
  • Mitchell C. Begelman
  • Alexander Philippov
  • Rostom Mbarek
  • Amelia M. Hankla
  • Erin Kara
  • Francesca Panessa
  • Ehud Behar
  • Haocheng Zhang
  • Fabio Pacucci
  • Main Pal
  • Federica Ricci
  • Ilaria Villani
  • Susanna Bisogni
  • Fabio La Franca
  • Stefano Bianchi
  • Gabriele Bruni
  • Cameron Hahn
  • Matt Nicholl
  • S. Bradley Cenko
  • Sabyasachi Chattopadhyay
  • Josefa Becerra González
  • J. A. Acosta–Pulido
  • Suvendu Rakshit
  • Jiří Svoboda
  • Luigi Gallo
  • Adam Ingram
  • Darshan Kakkad
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Article number125
<mark>Journal publication date</mark>10/03/2025
<mark>Journal</mark>The Astrophysical Journal
Issue number2
Volume981
Publication StatusPublished
Early online date4/03/25
<mark>Original language</mark>English

Abstract

We present results from a high-cadence multiwavelength observational campaign of the enigmatic changing-look active galactic nucleus 1ES 1927+654 from 2022 May to 2024 April, coincident with an unprecedented radio flare (an increase in flux by a factor of ∼60 over a few months) and the emergence of a spatially resolved jet at 0.1–0.3 pc scales. Companion work has also detected a recurrent quasi-periodic oscillation (QPO) in the 2–10 keV band with an increasing frequency (1–2 mHz) over the same period. During this time, the soft X-rays (0.3–2 keV) monotonically increased by a factor of ∼8, while the UV emission remained nearly steady with