The Astrophysical Journal (Jan 2025)
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
Affiliations
- Sibasish Laha
- ORCiD
- Astrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA ; [email protected], [email protected]; Center for Space Science and Technology, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA; Center for Research and Exploration in Space Science and Technology , NASA/GSFC, Greenbelt, MD 20771, USA
- Eileen T. Meyer
- ORCiD
- Department of Physics, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA
- Dev R. Sadaula
- ORCiD
- Astrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA ; [email protected], [email protected]; Center for Space Science and Technology, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA; Center for Research and Exploration in Space Science and Technology , NASA/GSFC, Greenbelt, MD 20771, USA
- Ritesh Ghosh
- ORCiD
- Astrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA ; [email protected], [email protected]; Center for Space Science and Technology, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA; Center for Research and Exploration in Space Science and Technology , NASA/GSFC, Greenbelt, MD 20771, USA; MKHS , Murshidabad, West Bengal, India 742401, India
- Dhrubojyoti Sengupta
- ORCiD
- Center for Space Science and Technology, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA
- Megan Masterson
- ORCiD
- MIT Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Onic I. Shuvo
- ORCiD
- Department of Physics, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA
- Matteo Guainazzi
- ORCiD
- European Space Agency (ESA) , European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
- Claudio Ricci
- ORCiD
- Instituto de Estudios Astrofísicos , Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People’s Republic of China
- Mitchell C. Begelman
- ORCiD
- JILA, University of Colorado and National Institute of Standards and Technology , 440 UCB, Boulder, CO 80309-0440, USA
- Alexander Philippov
- ORCiD
- Department of Physics, University of Maryland , College Park, MD 20742, USA
- Rostom Mbarek
- ORCiD
- Joint Space-Science Institute, University of Maryland , College Park, MD 20742, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USA
- Amelia M. Hankla
- ORCiD
- Joint Space-Science Institute, University of Maryland , College Park, MD 20742, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USA
- Erin Kara
- ORCiD
- MIT Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Francesca Panessa
- ORCiD
- INAF—Istituto di Astrofisica e Planetologia Spaziali , Via del Fosso del Cavaliere 100, Roma, 00133, Italy
- Ehud Behar
- ORCiD
- Department of Physics , Technion, Haifa 32000, Israel
- Haocheng Zhang
- ORCiD
- Astrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA ; [email protected], [email protected]; Center for Space Science and Technology, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA; Center for Research and Exploration in Space Science and Technology , NASA/GSFC, Greenbelt, MD 20771, USA
- Fabio Pacucci
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , Cambridge, MA 02138, USA; Black Hole Initiative, Harvard University , Cambridge, MA 02138, USA
- Main Pal
- ORCiD
- Department of Physics, Sri Venkateswara College, University of Delhi , Benito Juarez Road, Dhaula Kuan, New Delhi 110021, India
- Federica Ricci
- ORCiD
- Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre , Via della Vasca Navale 84, 00146, Roma, Italy; INAF-Osservatorio Astronomico di Roma , via Frascati 33, 00040 Monteporzio Catone, Italy
- Ilaria Villani
- ORCiD
- Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre , Via della Vasca Navale 84, 00146, Roma, Italy; INAF-Osservatorio Astronomico di Roma , via Frascati 33, 00040 Monteporzio Catone, Italy
- Susanna Bisogni
- ORCiD
- INAF–Istituto di Astrofisica Spaziale e Fisica Cosmica Milano , Via Corti 12, 20133 Milano, Italy
- Fabio La Franca
- ORCiD
- Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre , Via della Vasca Navale 84, 00146, Roma, Italy
- Stefano Bianchi
- ORCiD
- Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre , Via della Vasca Navale 84, 00146, Roma, Italy
- Gabriele Bruni
- ORCiD
- INAF—Istituto di Astrofisica e Planetologia Spaziali , Via del Fosso del Cavaliere 100, Roma, 00133, Italy
- Samantha Oates
- ORCiD
- Department of Physics, Lancaster University , Lancaster LA1 4YB, UK
- Cameron Hahn
- Department of Physics, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA
- Matt Nicholl
- ORCiD
- Astrophysics Research Centre, School of Mathematics and Physics, Queens University Belfast , Belfast BT7 1NN, UK
- S. Bradley Cenko
- ORCiD
- Astrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA ; [email protected], [email protected]; Joint Space-Science Institute, University of Maryland , College Park, MD 20742, USA
- Sabyasachi Chattopadhyay
- ORCiD
- South African Astronomical Observatory , 1 Observatory Rd., Observatory, Cape Town, 7925, South Africa; Centre for Space Research, North-West University , Potchefstroom 2520, South Africa
- Josefa Becerra González
- ORCiD
- Instituto de Astrofísica de Canarias (IAC) , E-38200 La Laguna, Tenerife, Spain; Universidad de La Laguna (ULL) , Departamento de Astrofísica, E-38206 La Laguna, Tenerife, Spain
- J. A. Acosta–Pulido
- ORCiD
- Instituto de Astrofísica de Canarias (IAC) , E-38200 La Laguna, Tenerife, Spain; Universidad de La Laguna (ULL) , Departamento de Astrofísica, E-38206 La Laguna, Tenerife, Spain
- Suvendu Rakshit
- ORCiD
- Aryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak, Nainital, 263002, India
- Jiří Svoboda
- ORCiD
- Astronomical Institute of the Czech Academy of Sciences , Boční II 1401/1, 14100 Praha 4, Czech Republic
- Luigi Gallo
- ORCiD
- Department of Astronomy and Physics, Saint Mary’s University , 923 Robie Street, Halifax, NS B3H 3C3, Canada
- Adam Ingram
- ORCiD
- School of Mathematics Statistics and Physics, Newcastle University , NE1 7RU, UK
- Darshan Kakkad
- ORCiD
- Centre for Astrophysics Research, University of Hertfordshire , Hatfield, AL10 9AB, UK
- DOI
- https://doi.org/10.3847/1538-4357/adaea0
- Journal volume & issue
-
Vol. 981,
no. 2
p. 125
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 <30% variation and the 2–10 keV flux showed variation by a factor ≲2. The weak variation of the 2–10 keV X-ray emission and the stability of the UV emission suggest that the magnetic energy density and accretion rate are relatively unchanged and that the jet could be launched owing to a reconfiguration of the magnetic field (toroidal to poloidal) close to the black hole. Advecting poloidal flux onto the event horizon would trigger the Blandford–Znajek mechanism, leading to the onset of the jet. The concurrent softening of the coronal slope (from Γ = 2.70 ± 0.04 to Γ = 3.27 ± 0.04), the appearance of a QPO, and the low coronal temperature ( $k{T}_{e}={8}_{-3}^{+8}\,\,{\rm{keV}}$ ) during the radio outburst suggest that the poloidal field reconfiguration can significantly impact coronal properties and thus influence jet dynamics. These extraordinary findings in real time are crucial for coronal and jet plasma studies, particularly as our results are independent of coronal geometry.
Keywords
