Late-time radio brightening and emergence of a radio jet in the changing-look AGN 1ES 1927+654
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| Format: | Preprint |
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2024
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| author | Meyer, Eileen T. Laha, Sibasish Shuvo, Onic I. Roychowdhury, Agniva Green, David A. Rhodes, Lauren Hankla, Amelia M. Philippov, Alexander Mbarek, Rostom laor, Ari Begelman, Mitchell C. Sadaula, Dev R. Ghosh, Ritesh Bruni, Gabriele Panessa, Francesca Guainazzi, Matteo Behar, Ehud Masterson, Megan Zhang, Haocheng Yang, Xiaolong Gurwell, Mark A. Keating, Garrett K. Williams-Baldwin, David Bray, Justin D. Bempong-Manful, Emmanuel K. Wrigley, Nicholas Bianchi, Stefano Ricci, Federica La Franca, Fabio Kara, Erin Georganopoulos, Markos Oates, Samantha Nicholl, Matt Pal, Main Cenko, S. Bradley |
| author_facet | Meyer, Eileen T. Laha, Sibasish Shuvo, Onic I. Roychowdhury, Agniva Green, David A. Rhodes, Lauren Hankla, Amelia M. Philippov, Alexander Mbarek, Rostom laor, Ari Begelman, Mitchell C. Sadaula, Dev R. Ghosh, Ritesh Bruni, Gabriele Panessa, Francesca Guainazzi, Matteo Behar, Ehud Masterson, Megan Zhang, Haocheng Yang, Xiaolong Gurwell, Mark A. Keating, Garrett K. Williams-Baldwin, David Bray, Justin D. Bempong-Manful, Emmanuel K. Wrigley, Nicholas Bianchi, Stefano Ricci, Federica La Franca, Fabio Kara, Erin Georganopoulos, Markos Oates, Samantha Nicholl, Matt Pal, Main Cenko, S. Bradley |
| contents | We present multi-frequency (5-345 GHz) and multi-resolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic nuclei (CL-AGN). 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 radio-quiet AGN. Starting in February 2023, 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 years old. Recent high-resolution VLBA 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-AGN and tidal disruption events which show late-time radio activity, years after the initial outburst. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_18061 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Late-time radio brightening and emergence of a radio jet in the changing-look AGN 1ES 1927+654 Meyer, Eileen T. Laha, Sibasish Shuvo, Onic I. Roychowdhury, Agniva Green, David A. Rhodes, Lauren Hankla, Amelia M. Philippov, Alexander Mbarek, Rostom laor, Ari Begelman, Mitchell C. Sadaula, Dev R. Ghosh, Ritesh Bruni, Gabriele Panessa, Francesca Guainazzi, Matteo Behar, Ehud Masterson, Megan Zhang, Haocheng Yang, Xiaolong Gurwell, Mark A. Keating, Garrett K. Williams-Baldwin, David Bray, Justin D. Bempong-Manful, Emmanuel K. Wrigley, Nicholas Bianchi, Stefano Ricci, Federica La Franca, Fabio Kara, Erin Georganopoulos, Markos Oates, Samantha Nicholl, Matt Pal, Main Cenko, S. Bradley High Energy Astrophysical Phenomena Astrophysics of Galaxies We present multi-frequency (5-345 GHz) and multi-resolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic nuclei (CL-AGN). 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 radio-quiet AGN. Starting in February 2023, 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 years old. Recent high-resolution VLBA 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-AGN and tidal disruption events which show late-time radio activity, years after the initial outburst. |
| title | Late-time radio brightening and emergence of a radio jet in the changing-look AGN 1ES 1927+654 |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2406.18061 |