The Astrophysical Journal Letters (Jan 2025)
Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654
- 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
Affiliations
- Eileen T. Meyer
- ORCiD
- Department of Physics, University of Maryland, Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA
- Sibasish Laha
- ORCiD
- Astrophysics 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
- Onic I. Shuvo
- ORCiD
- Department of Physics, University of Maryland, Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA
- Agniva Roychowdhury
- ORCiD
- Department 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, USA
- David A. Green
- ORCiD
- Astrophysics Group, Cavendish Laboratory , 19 J.J. Thomson Avenue, Cambridge CB3 0HE, UK
- Lauren Rhodes
- ORCiD
- Astrophysics, The University of Oxford , Keble Road, Oxford OX1 3RH, UK
- 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, 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, USA
- Ari laor
- ORCiD
- Department of Physics , Technion, Haifa 32000, Israel
- Mitchell C. Begelman
- ORCiD
- JILA, University of Colorado and National Institute of Standards and Technology , 440 UCB, Boulder, CO 80309-0440, USA
- Dev R. Sadaula
- Astrophysics 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
- Ritesh Ghosh
- ORCiD
- Astrophysics 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, India
- Gabriele Bruni
- ORCiD
- INAF—Istituto di Astrofisica e Planetologia Spaziali , Via del Fosso del Cavaliere 100, Roma 00133, Italy
- Francesca Panessa
- ORCiD
- INAF—Istituto di Astrofisica e Planetologia Spaziali , Via del Fosso del Cavaliere 100, Roma 00133, Italy
- Matteo Guainazzi
- ORCiD
- European Space Agency (ESA), European Space Research and Technology Centre (ESTEC) , Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
- Ehud Behar
- ORCiD
- Department of Physics , Technion, Haifa 32000, Israel; Department of Physics & Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Megan Masterson
- ORCiD
- Department of Physics & Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Haocheng Zhang
- ORCiD
- Astrophysics 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
- Xiaolong Yang
- ORCiD
- Shanghai Astronomical Observatory , CAS, 80 Nandan Road, Shanghai 200030, People's Republic of China
- Mark A. Gurwell
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Garrett K. Keating
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- David Williams-Baldwin
- ORCiD
- Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester , Manchester M13 9PL, UK
- Justin D. Bray
- ORCiD
- Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester , Manchester M13 9PL, UK
- Emmanuel K. Bempong-Manful
- ORCiD
- Jodrell 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, UK
- Nicholas Wrigley
- Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester , Manchester M13 9PL, UK
- Stefano Bianchi
- ORCiD
- Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre , via della Vasca Navale 84, I-00146 Roma, Italy
- Federica Ricci
- ORCiD
- Dipartimento 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, Italy
- Fabio La Franca
- ORCiD
- Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre , via della Vasca Navale 84, I-00146 Roma, Italy
- Erin Kara
- ORCiD
- Department of Physics & Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Markos Georganopoulos
- ORCiD
- Department of Physics, University of Maryland, Baltimore County , 1000 Hilltop Circle, Baltimore, MD 21250, USA
- Samantha Oates
- Birmingham Institute for Gravitational Wave Astronomy and School of Physics and Astronomy, University of Birmingham , Birmingham B15 2TT, UK
- Matt Nicholl
- ORCiD
- Astrophysics Research Centre, School of Mathematics and Physics, Queens University Belfast , Belfast BT7 1NN, UK
- Main Pal
- ORCiD
- Department of Physics, Sri Venkateswara College, University of Delhi , Benito Juarez Road, Dhaula Kuan, New Delhi—110021, India
- S. Bradley Cenko
- ORCiD
- Astrophysics Science Division, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA; Joint Space-Science Institute, University of Maryland , College Park, MD 20742, USA
- DOI
- https://doi.org/10.3847/2041-8213/ad8651
- Journal volume & issue
-
Vol. 979,
no. 1
p. L2
Abstract
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.
Keywords
- Radio jets
- Active galactic nuclei
- Proper motions
- X-ray active galactic nuclei
- Radio active galactic nuclei
- Seyfert galaxies
