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

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; Samantha Oates; 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

doi:10.3847/1538-4357/adaea0

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

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 RicciIlaria Villani, Susanna Bisogni, Fabio La Franca, Stefano Bianchi, Gabriele Bruni, Samantha Oates, 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

Research output: Contribution to journal › Article › peer-review

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

Original language	English
Article number	125
Pages (from-to)	1-20
Number of pages	20
Journal	The Astrophysical Journal
Volume	981
Issue number	2
Early online date	4 Mar 2025
DOIs	https://doi.org/10.3847/1538-4357/adaea0
Publication status	Published - 10 Mar 2025

Keywords

Active galaxies
Supermassive black holes

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© 2025 The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/
Final published version, 28.6 MBLicence: CC BY

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Laha, S., Meyer, E. T., Sadaula, D. R., Ghosh, R., Sengupta, D., Masterson, M., Shuvo, O. I., Guainazzi, M., Ricci, C., Begelman, M. C., Philippov, A., Mbarek, R., Hankla, A. M., Kara, E., Panessa, F., Behar, E., Zhang, H., Pacucci, F., Pal, M., ... Kakkad, D. (2025). Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654. The Astrophysical Journal, 981(2), 1-20. Article 125. https://doi.org/10.3847/1538-4357/adaea0

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

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",

keywords = "Active galaxies, Supermassive black holes",

author = "Sibasish Laha and Meyer, {Eileen T.} and Sadaula, {Dev R.} and Ritesh Ghosh and Dhrubojyoti Sengupta and Megan Masterson and Shuvo, {Onic I.} and Matteo Guainazzi and Claudio Ricci and Begelman, {Mitchell C.} and Alexander Philippov and Rostom Mbarek and Hankla, {Amelia M.} and Erin Kara and Francesca Panessa and Ehud Behar and Haocheng Zhang and Fabio Pacucci and Main Pal and Federica Ricci and Ilaria Villani and Susanna Bisogni and {La Franca}, Fabio and Stefano Bianchi and Gabriele Bruni and Samantha Oates and Cameron Hahn and Matt Nicholl and Cenko, {S. Bradley} and Sabyasachi Chattopadhyay and {Becerra Gonz{\'a}lez}, Josefa and Acosta–Pulido, {J. A.} and Suvendu Rakshit and Ji{\v r}{\'i} Svoboda and Luigi Gallo and Adam Ingram and Darshan Kakkad",

note = "{\textcopyright} 2025 The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/ ",

year = "2025",

month = mar,

day = "10",

doi = "10.3847/1538-4357/adaea0",

language = "English",

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Laha, S, Meyer, ET, Sadaula, DR, Ghosh, R, Sengupta, D, Masterson, M, Shuvo, OI, Guainazzi, M, Ricci, C, Begelman, MC, Philippov, A, Mbarek, R, Hankla, AM, Kara, E, Panessa, F, Behar, E, Zhang, H, Pacucci, F, Pal, M, Ricci, F, Villani, I, Bisogni, S, La Franca, F, Bianchi, S, Bruni, G, Oates, S, Hahn, C, Nicholl, M, Cenko, SB, Chattopadhyay, S, Becerra González, J, Acosta–Pulido, JA, Rakshit, S, Svoboda, J, Gallo, L, Ingram, A & Kakkad, D 2025, 'Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654', The Astrophysical Journal, vol. 981, no. 2, 125, pp. 1-20. https://doi.org/10.3847/1538-4357/adaea0

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T1 - Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654

AU - Laha, Sibasish

AU - Meyer, Eileen T.

AU - Sadaula, Dev R.

AU - Ghosh, Ritesh

AU - Sengupta, Dhrubojyoti

AU - Masterson, Megan

AU - Shuvo, Onic I.

AU - Guainazzi, Matteo

AU - Ricci, Claudio

AU - Begelman, Mitchell C.

AU - Philippov, Alexander

AU - Mbarek, Rostom

AU - Hankla, Amelia M.

AU - Kara, Erin

AU - Panessa, Francesca

AU - Behar, Ehud

AU - Zhang, Haocheng

AU - Pacucci, Fabio

AU - Pal, Main

AU - Ricci, Federica

AU - Villani, Ilaria

AU - Bisogni, Susanna

AU - La Franca, Fabio

AU - Bianchi, Stefano

AU - Bruni, Gabriele

AU - Oates, Samantha

AU - Hahn, Cameron

AU - Nicholl, Matt

AU - Cenko, S. Bradley

AU - Chattopadhyay, Sabyasachi

AU - Becerra González, Josefa

AU - Acosta–Pulido, J. A.

AU - Rakshit, Suvendu

AU - Svoboda, Jiří

AU - Gallo, Luigi

AU - Ingram, Adam

AU - Kakkad, Darshan

N1 - © 2025 The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/

PY - 2025/3/10

Y1 - 2025/3/10

N2 - 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

AB - 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

KW - Active galaxies

KW - Supermassive black holes

U2 - 10.3847/1538-4357/adaea0

DO - 10.3847/1538-4357/adaea0

M3 - Article

SN - 0004-637X

VL - 981

SP - 1

EP - 20

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 2

M1 - 125

ER -

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

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Keywords

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