Multi-wavelength observations of a jet launch in real time from the post-changing-look Active Galaxy 1ES 1927+654

We present results from a high cadence multi-wavelength observational campaign of the enigmatic changing look AGN 1ES 1927+654 from May 2022- April 2024, coincident with an unprecedented radio flare (an increase in flux by a factor of $\sim 60$ over a few months) and the emergence of a spatially res...

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Hauptverfasser: Laha, Sibasish, Meyer, Eileen T, Sadaula, Dev R, Ghosh, Ritesh, Sengupta, Dhrubojyoti, Masterson, Megan, Shuvo, Onic I, Guainazzi, Matteo, Ricci, Claudio, Begelman, Mitchell C, Philippov, Alexander, Mbarek, Rostom, Hankla, Amelia M, Kara, Erin, Panessa, Francesca, Behar, Ehud, Zhang, Haocheng, Pacucci, Fabio, Pal, Main, Ricci, Federica, Villani, Ilaria, Bisogni, Susanna, La Franca, Fabio, Bianchi, Stefano, Bruni, Gabriele, Oates, Samantha, Hahn, Cameron, Nicholl, Matt, Cenko, S. Bradley, Chattopadhyay, Sabyasachi, Gonzalez, Josefa Becerra, Acosta-Pulido, J. A, Rakshit, Suvendu, Svoboda, Jiri, Gallo, Luigi, Ingram, Adam, Kakkad, Darshan
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Zusammenfassung:We present results from a high cadence multi-wavelength observational campaign of the enigmatic changing look AGN 1ES 1927+654 from May 2022- April 2024, coincident with an unprecedented radio flare (an increase in flux by a factor of $\sim 60$ over a few months) and the emergence of a spatially resolved jet at $0.1-0.3$ pc scales (Meyer et al. 2024). 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 (Masterson et al., 2025). During this time, the soft X-rays ($0.3-2$ keV) monotonically increased by a factor of $\sim 8$, while the UV emission remained near-steady with $
DOI:10.48550/arxiv.2501.02340