Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654
We present multifrequency (5–345 GHz) and multiresolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic nuclei (CL-AGNs). The source was first designated a CL-AGN after an optical outburst in late 2017 and has since displayed...
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2025-01-01
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| author | Eileen T. Meyer Sibasish Laha Onic I. Shuvo Agniva Roychowdhury David A. Green Lauren Rhodes Amelia M. Hankla Alexander Philippov Rostom Mbarek Ari laor Mitchell C. Begelman Dev R. Sadaula Ritesh Ghosh Gabriele Bruni Francesca Panessa Matteo Guainazzi Ehud Behar Megan Masterson Haocheng Zhang Xiaolong Yang Mark A. Gurwell Garrett K. Keating David Williams-Baldwin Justin D. Bray Emmanuel K. Bempong-Manful Nicholas Wrigley Stefano Bianchi Federica Ricci Fabio La Franca Erin Kara Markos Georganopoulos Samantha Oates Matt Nicholl Main Pal S. Bradley Cenko |
| author_facet | Eileen T. Meyer Sibasish Laha Onic I. Shuvo Agniva Roychowdhury David A. Green Lauren Rhodes Amelia M. Hankla Alexander Philippov Rostom Mbarek Ari laor Mitchell C. Begelman Dev R. Sadaula Ritesh Ghosh Gabriele Bruni Francesca Panessa Matteo Guainazzi Ehud Behar Megan Masterson Haocheng Zhang Xiaolong Yang Mark A. Gurwell Garrett K. Keating David Williams-Baldwin Justin D. Bray Emmanuel K. Bempong-Manful Nicholas Wrigley Stefano Bianchi Federica Ricci Fabio La Franca Erin Kara Markos Georganopoulos Samantha Oates Matt Nicholl Main Pal S. Bradley Cenko |
| author_sort | Eileen T. Meyer |
| collection | DOAJ |
| description | We present multifrequency (5–345 GHz) and multiresolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic nuclei (CL-AGNs). The source was first designated a CL-AGN after an optical outburst in late 2017 and has since displayed considerable changes in X-ray emission, including the destruction and rebuilding of the X-ray corona in 2019–2020. Radio observations prior to 2023 show a faint and compact radio source typical of a radio-quiet AGN. Starting in 2023 February, 1ES 1927+654 began exhibiting a radio flare with a steep exponential rise, reaching a peak 60 times previous flux levels, and has maintained this higher level of radio emission for over a year to date. The 5–23 GHz spectrum is broadly similar to gigahertz-peaked radio sources, which are understood to be young radio jets less than ∼1000 yr old. Recent high-resolution Very Long Baseline Array observations at 23.5 GHz now show resolved extensions on either side of the core, with a separation of ∼0.15 pc, consistent with a new and mildly relativistic bipolar outflow. A steady increase in the soft X-ray band (0.3–2 keV) concurrent with the radio may be consistent with jet-driven shocked gas, though further observations are needed to test alternate scenarios. This source joins a growing number of CL-AGNs and tidal disruption events that show late-time radio activity, years after the initial outburst. |
| format | Article |
| id | doaj-art-ec2416506e4e4b20b7a317253220c92e |
| institution | Kabale University |
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| language | English |
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| spelling | doaj-art-ec2416506e4e4b20b7a317253220c92e2025-01-13T14:15:47ZengIOP PublishingThe Astrophysical Journal Letters2041-82052025-01-019791L210.3847/2041-8213/ad8651Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654Eileen T. Meyer0https://orcid.org/0000-0002-7676-9962Sibasish Laha1https://orcid.org/0000-0003-2714-0487Onic I. Shuvo2https://orcid.org/0000-0003-4727-2209Agniva Roychowdhury3https://orcid.org/0000-0003-1101-8436David A. Green4https://orcid.org/0000-0003-3189-9998Lauren Rhodes5https://orcid.org/0000-0003-2705-4941Amelia M. Hankla6https://orcid.org/0000-0001-9725-5509Alexander Philippov7https://orcid.org/0000-0001-7801-0362Rostom Mbarek8https://orcid.org/0000-0001-9475-5292Ari laor9https://orcid.org/0000-0002-1615-179XMitchell C. Begelman10https://orcid.org/0000-0003-0936-8488Dev R. Sadaula11Ritesh Ghosh12https://orcid.org/0000-0003-4790-2653Gabriele Bruni13https://orcid.org/0000-0002-5182-6289Francesca Panessa14https://orcid.org/0000-0003-0543-3617Matteo Guainazzi15https://orcid.org/0000-0002-1094-3147Ehud Behar16https://orcid.org/0000-0001-9735-4873Megan Masterson17https://orcid.org/0000-0003-4127-0739Haocheng Zhang18https://orcid.org/0000-0001-9826-1759Xiaolong Yang19https://orcid.org/0000-0002-4439-5580Mark A. Gurwell20https://orcid.org/0000-0003-0685-3621Garrett K. Keating21https://orcid.org/0000-0002-3490-146XDavid Williams-Baldwin22https://orcid.org/0000-0001-7361-0246Justin D. Bray23https://orcid.org/0000-0002-0963-0223Emmanuel K. Bempong-Manful24https://orcid.org/0000-0002-1727-1224Nicholas Wrigley25Stefano Bianchi26https://orcid.org/0000-0002-4622-4240Federica Ricci27https://orcid.org/0000-0001-5742-5980Fabio La Franca28https://orcid.org/0000-0002-1239-2721Erin Kara29https://orcid.org/0000-0003-0172-0854Markos Georganopoulos30https://orcid.org/0000-0002-2040-8666Samantha Oates31Matt Nicholl32https://orcid.org/0000-0002-2555-3192Main Pal33https://orcid.org/0000-0001-6523-6522S. Bradley Cenko34https://orcid.org/0000-0003-1673-970XDepartment 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; 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, USADepartment of Physics, University of Maryland, Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA; Space Telescope Science Institute , 3700 San Martin Dr., Baltimore, MD 21218, USAAstrophysics Group, Cavendish Laboratory , 19 J.J. Thomson Avenue, Cambridge CB3 0HE, UKAstrophysics, The University of Oxford , Keble Road, Oxford OX1 3RH, UKJoint Space-Science Institute, University of Maryland , College Park, MD 20742, USA; Department of Astronomy, University of Maryland , College Park, MD, 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, USADepartment of Physics , Technion, Haifa 32000, IsraelJILA, University of Colorado and National Institute of Standards and Technology , 440 UCB, Boulder, CO 80309-0440, USAAstrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA; 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; 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, 742401, IndiaINAF—Istituto di Astrofisica e Planetologia Spaziali , Via del Fosso del Cavaliere 100, Roma 00133, ItalyINAF—Istituto di Astrofisica e Planetologia Spaziali , Via del Fosso del Cavaliere 100, Roma 00133, ItalyEuropean Space Agency (ESA), European Space Research and Technology Centre (ESTEC) , Keplerlaan 1, 2201 AZ Noordwijk, The NetherlandsDepartment of Physics , Technion, Haifa 32000, Israel; Department of Physics & Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USADepartment of Physics & Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USAAstrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA; Center for Space Science and Technology, University of Maryland, Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USAShanghai Astronomical Observatory , CAS, 80 Nandan Road, Shanghai 200030, People's Republic of ChinaCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USAJodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester , Manchester M13 9PL, UKJodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester , Manchester M13 9PL, UKJodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester , Manchester M13 9PL, UK; School of Physics, University of Bristol , Tyndall Avenue, Bristol BS8 1TL, UKJodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester , Manchester M13 9PL, UKDipartimento di Matematica e Fisica, Università degli Studi Roma Tre , via della Vasca Navale 84, I-00146 Roma, ItalyDipartimento di Matematica e Fisica, Università degli Studi Roma Tre , via della Vasca Navale 84, I-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, I-00146 Roma, ItalyDepartment of Physics & 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, USABirmingham Institute for Gravitational Wave Astronomy and School of Physics and Astronomy, University of Birmingham , Birmingham B15 2TT, UKAstrophysics Research Centre, School of Mathematics and Physics, Queens University Belfast , Belfast BT7 1NN, UKDepartment of Physics, Sri Venkateswara College, University of Delhi , Benito Juarez Road, Dhaula Kuan, New Delhi—110021, IndiaAstrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA; Joint Space-Science Institute, University of Maryland , College Park, MD 20742, USAWe present multifrequency (5–345 GHz) and multiresolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic nuclei (CL-AGNs). The source was first designated a CL-AGN after an optical outburst in late 2017 and has since displayed considerable changes in X-ray emission, including the destruction and rebuilding of the X-ray corona in 2019–2020. Radio observations prior to 2023 show a faint and compact radio source typical of a radio-quiet AGN. Starting in 2023 February, 1ES 1927+654 began exhibiting a radio flare with a steep exponential rise, reaching a peak 60 times previous flux levels, and has maintained this higher level of radio emission for over a year to date. The 5–23 GHz spectrum is broadly similar to gigahertz-peaked radio sources, which are understood to be young radio jets less than ∼1000 yr old. Recent high-resolution Very Long Baseline Array observations at 23.5 GHz now show resolved extensions on either side of the core, with a separation of ∼0.15 pc, consistent with a new and mildly relativistic bipolar outflow. A steady increase in the soft X-ray band (0.3–2 keV) concurrent with the radio may be consistent with jet-driven shocked gas, though further observations are needed to test alternate scenarios. This source joins a growing number of CL-AGNs and tidal disruption events that show late-time radio activity, years after the initial outburst.https://doi.org/10.3847/2041-8213/ad8651Radio jetsActive galactic nucleiProper motionsX-ray active galactic nucleiRadio active galactic nucleiSeyfert galaxies |
| spellingShingle | Eileen T. Meyer Sibasish Laha Onic I. Shuvo Agniva Roychowdhury David A. Green Lauren Rhodes Amelia M. Hankla Alexander Philippov Rostom Mbarek Ari laor Mitchell C. Begelman Dev R. Sadaula Ritesh Ghosh Gabriele Bruni Francesca Panessa Matteo Guainazzi Ehud Behar Megan Masterson Haocheng Zhang Xiaolong Yang Mark A. Gurwell Garrett K. Keating David Williams-Baldwin Justin D. Bray Emmanuel K. Bempong-Manful Nicholas Wrigley Stefano Bianchi Federica Ricci Fabio La Franca Erin Kara Markos Georganopoulos Samantha Oates Matt Nicholl Main Pal S. Bradley Cenko Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654 The Astrophysical Journal Letters Radio jets Active galactic nuclei Proper motions X-ray active galactic nuclei Radio active galactic nuclei Seyfert galaxies |
| title | Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654 |
| title_full | Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654 |
| title_fullStr | Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654 |
| title_full_unstemmed | Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654 |
| title_short | Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654 |
| title_sort | late time radio brightening and emergence of a radio jet in the changing look agn 1es 1927 654 |
| topic | Radio jets Active galactic nuclei Proper motions X-ray active galactic nuclei Radio active galactic nuclei Seyfert galaxies |
| url | https://doi.org/10.3847/2041-8213/ad8651 |
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