Multiwavelength 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 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...
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2025-01-01
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| author | 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 |
| author_facet | 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 |
| author_sort | Sibasish Laha |
| collection | DOAJ |
| description | 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. |
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| id | doaj-art-28b59fdf08e94bb19dd64c80df7fdd09 |
| institution | DOAJ |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
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| series | The Astrophysical Journal |
| spelling | doaj-art-28b59fdf08e94bb19dd64c80df7fdd092025-08-20T02:47:14ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01981212510.3847/1538-4357/adaea0Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654Sibasish Laha0https://orcid.org/0000-0003-2714-0487Eileen T. Meyer1https://orcid.org/0000-0002-7676-9962Dev R. Sadaula2https://orcid.org/0000-0002-9163-8653Ritesh Ghosh3https://orcid.org/0000-0003-4790-2653Dhrubojyoti Sengupta4https://orcid.org/0009-0002-6991-1534Megan Masterson5https://orcid.org/0000-0003-4127-0739Onic I. Shuvo6https://orcid.org/0000-0003-4727-2209Matteo Guainazzi7https://orcid.org/0000-0002-1094-3147Claudio Ricci8https://orcid.org/0000-0001-5231-2645Mitchell C. Begelman9https://orcid.org/0000-0003-0936-8488Alexander Philippov10https://orcid.org/0000-0001-7801-0362Rostom Mbarek11https://orcid.org/0000-0001-9475-5292Amelia M. Hankla12https://orcid.org/0000-0001-9725-5509Erin Kara13https://orcid.org/0000-0003-0172-0854Francesca Panessa14https://orcid.org/0000-0003-0543-3617Ehud Behar15https://orcid.org/0000-0001-9735-4873Haocheng Zhang16https://orcid.org/0000-0001-9826-1759Fabio Pacucci17https://orcid.org/0000-0001-9879-7780Main Pal18https://orcid.org/0000-0001-6523-6522Federica Ricci19https://orcid.org/0000-0001-5742-5980Ilaria Villani20https://orcid.org/0009-0006-7483-0463Susanna Bisogni21https://orcid.org/0000-0003-3746-4565Fabio La Franca22https://orcid.org/0000-0002-1239-2721Stefano Bianchi23https://orcid.org/0000-0002-4622-4240Gabriele Bruni24https://orcid.org/0000-0002-5182-6289Samantha Oates25https://orcid.org/0000-0001-9309-7873Cameron Hahn26Matt Nicholl27https://orcid.org/0000-0002-2555-3192S. Bradley Cenko28https://orcid.org/0000-0003-1673-970XSabyasachi Chattopadhyay29https://orcid.org/0000-0003-1601-8048Josefa Becerra González30https://orcid.org/0000-0002-6729-9022J. A. Acosta–Pulido31https://orcid.org/0000-0002-0433-9656Suvendu Rakshit32https://orcid.org/0000-0002-8377-9667Jiří Svoboda33https://orcid.org/0000-0003-2931-0742Luigi Gallo34https://orcid.org/0009-0006-4968-7108Adam Ingram35https://orcid.org/0000-0002-5311-9078Darshan Kakkad36https://orcid.org/0000-0002-2603-2639Astrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA ; sib.laha@gmail.com, sibasish.laha@nasa.gov; 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, USADepartment of Physics, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USAAstrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA ; sib.laha@gmail.com, sibasish.laha@nasa.gov; 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, USAAstrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA ; sib.laha@gmail.com, sibasish.laha@nasa.gov; 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, IndiaCenter for Space Science and Technology, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USAMIT Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USADepartment of Physics, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USAEuropean Space Agency (ESA) , European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201 AZ Noordwijk, The NetherlandsInstituto 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 ChinaJILA, University of Colorado and National Institute of Standards and Technology , 440 UCB, Boulder, CO 80309-0440, USADepartment of Physics, University of Maryland , College Park, MD 20742, USAJoint Space-Science Institute, University of Maryland , College Park, MD 20742, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USAJoint Space-Science Institute, University of Maryland , College Park, MD 20742, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USAMIT Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USAINAF—Istituto di Astrofisica e Planetologia Spaziali , Via del Fosso del Cavaliere 100, Roma, 00133, ItalyDepartment of Physics , Technion, Haifa 32000, IsraelAstrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA ; sib.laha@gmail.com, sibasish.laha@nasa.gov; 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, USACenter for Astrophysics ∣ Harvard & Smithsonian , Cambridge, MA 02138, USA; Black Hole Initiative, Harvard University , Cambridge, MA 02138, USADepartment of Physics, Sri Venkateswara College, University of Delhi , Benito Juarez Road, Dhaula Kuan, New Delhi 110021, IndiaDipartimento 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, ItalyDipartimento 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, ItalyINAF–Istituto di Astrofisica Spaziale e Fisica Cosmica Milano , Via Corti 12, 20133 Milano, ItalyDipartimento di Matematica e Fisica, Università degli Studi Roma Tre , Via della Vasca Navale 84, 00146, Roma, ItalyDipartimento di Matematica e Fisica, Università degli Studi Roma Tre , Via della Vasca Navale 84, 00146, Roma, ItalyINAF—Istituto di Astrofisica e Planetologia Spaziali , Via del Fosso del Cavaliere 100, Roma, 00133, ItalyDepartment of Physics, Lancaster University , Lancaster LA1 4YB, UKDepartment of Physics, University of Maryland Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USAAstrophysics Research Centre, School of Mathematics and Physics, Queens University Belfast , Belfast BT7 1NN, UKAstrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA ; sib.laha@gmail.com, sibasish.laha@nasa.gov; Joint Space-Science Institute, University of Maryland , College Park, MD 20742, USASouth African Astronomical Observatory , 1 Observatory Rd., Observatory, Cape Town, 7925, South Africa; Centre for Space Research, North-West University , Potchefstroom 2520, South AfricaInstituto de Astrofísica de Canarias (IAC) , E-38200 La Laguna, Tenerife, Spain; Universidad de La Laguna (ULL) , Departamento de Astrofísica, E-38206 La Laguna, Tenerife, SpainInstituto de Astrofísica de Canarias (IAC) , E-38200 La Laguna, Tenerife, Spain; Universidad de La Laguna (ULL) , Departamento de Astrofísica, E-38206 La Laguna, Tenerife, SpainAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak, Nainital, 263002, IndiaAstronomical Institute of the Czech Academy of Sciences , Boční II 1401/1, 14100 Praha 4, Czech RepublicDepartment of Astronomy and Physics, Saint Mary’s University , 923 Robie Street, Halifax, NS B3H 3C3, CanadaSchool of Mathematics Statistics and Physics, Newcastle University , NE1 7RU, UKCentre for Astrophysics Research, University of Hertfordshire , Hatfield, AL10 9AB, UKWe 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.https://doi.org/10.3847/1538-4357/adaea0Active galaxiesSupermassive black holes |
| spellingShingle | 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 Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654 The Astrophysical Journal Active galaxies Supermassive black holes |
| title | Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654 |
| title_full | Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654 |
| title_fullStr | Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654 |
| title_full_unstemmed | Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654 |
| title_short | Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654 |
| title_sort | multiwavelength observations of a jet launch in real time from the post changing look active galaxy 1es 1927 654 |
| topic | Active galaxies Supermassive black holes |
| url | https://doi.org/10.3847/1538-4357/adaea0 |
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