Multi-wavelength observations of a jet launch in real time from the post-changing-look Active Galaxy 1ES 1927+654
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866913636348329984 |
|---|---|
| author | Laha, Sibasish Meyer, Eileen T. Sadaula, Dev R. Ghosh, Ritesh Sengupta, Dhrubojyoti Masterson, Megan Shuvo, Onic I. Guainazzi, Matteo Ricci, Claudio Begelman, Mitchell C. Philippov, Alexander Mbarek, Rostom Hankla, Amelia M. Kara, Erin Panessa, Francesca Behar, Ehud Zhang, Haocheng Pacucci, Fabio Pal, Main Ricci, Federica Villani, Ilaria Bisogni, Susanna La Franca, Fabio Bianchi, Stefano Bruni, Gabriele Oates, Samantha Hahn, Cameron Nicholl, Matt Cenko, S. Bradley Chattopadhyay, Sabyasachi Gonzalez, Josefa Becerra Acosta-Pulido, J. A. Rakshit, Suvendu Svoboda, Jiri Gallo, Luigi Ingram, Adam Kakkad, Darshan |
| author_facet | Laha, Sibasish Meyer, Eileen T. Sadaula, Dev R. Ghosh, Ritesh Sengupta, Dhrubojyoti Masterson, Megan Shuvo, Onic I. Guainazzi, Matteo Ricci, Claudio Begelman, Mitchell C. Philippov, Alexander Mbarek, Rostom Hankla, Amelia M. Kara, Erin Panessa, Francesca Behar, Ehud Zhang, Haocheng Pacucci, Fabio Pal, Main Ricci, Federica Villani, Ilaria Bisogni, Susanna La Franca, Fabio Bianchi, Stefano Bruni, Gabriele Oates, Samantha Hahn, Cameron Nicholl, Matt Cenko, S. Bradley Chattopadhyay, Sabyasachi Gonzalez, Josefa Becerra Acosta-Pulido, J. A. Rakshit, Suvendu Svoboda, Jiri Gallo, Luigi Ingram, Adam Kakkad, Darshan |
| contents | We present results from a high cadence multi-wavelength observational campaign of the enigmatic changing look AGN 1ES 1927+654 from May 2022- April 2024, coincident with an unprecedented radio flare (an increase in flux by a factor of $\sim 60$ over a few months) and the emergence of a spatially resolved jet at $0.1-0.3$ pc scales (Meyer et al. 2024). 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 (Masterson et al., 2025). During this time, the soft X-rays ($0.3-2$ keV) monotonically increased by a factor of $\sim 8$, while the UV emission remained near-steady with $<30\%$ variation and the $2-10$ keV flux showed variation by a factor $\lesssim 2$. 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 due 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 (BZ) mechanism, leading to the onset of the jet. The concurrent softening of the coronal slope (from $Γ= 2.70\pm 0.04$ to $Γ=3.27\pm 0.04$), the appearance of a QPO, and low coronal temperature ($kT_{e}=8_{-3}^{+8}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_02340 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multi-wavelength observations of a jet launch in real time from the post-changing-look Active Galaxy 1ES 1927+654 Laha, Sibasish Meyer, Eileen T. Sadaula, Dev R. Ghosh, Ritesh Sengupta, Dhrubojyoti Masterson, Megan Shuvo, Onic I. Guainazzi, Matteo Ricci, Claudio Begelman, Mitchell C. Philippov, Alexander Mbarek, Rostom Hankla, Amelia M. Kara, Erin Panessa, Francesca Behar, Ehud Zhang, Haocheng Pacucci, Fabio Pal, Main Ricci, Federica Villani, Ilaria Bisogni, Susanna La Franca, Fabio Bianchi, Stefano Bruni, Gabriele Oates, Samantha Hahn, Cameron Nicholl, Matt Cenko, S. Bradley Chattopadhyay, Sabyasachi Gonzalez, Josefa Becerra Acosta-Pulido, J. A. Rakshit, Suvendu Svoboda, Jiri Gallo, Luigi Ingram, Adam Kakkad, Darshan High Energy Astrophysical Phenomena Astrophysics of Galaxies High Energy Physics - Phenomenology We present results from a high cadence multi-wavelength observational campaign of the enigmatic changing look AGN 1ES 1927+654 from May 2022- April 2024, coincident with an unprecedented radio flare (an increase in flux by a factor of $\sim 60$ over a few months) and the emergence of a spatially resolved jet at $0.1-0.3$ pc scales (Meyer et al. 2024). 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 (Masterson et al., 2025). During this time, the soft X-rays ($0.3-2$ keV) monotonically increased by a factor of $\sim 8$, while the UV emission remained near-steady with $<30\%$ variation and the $2-10$ keV flux showed variation by a factor $\lesssim 2$. 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 due 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 (BZ) mechanism, leading to the onset of the jet. The concurrent softening of the coronal slope (from $Γ= 2.70\pm 0.04$ to $Γ=3.27\pm 0.04$), the appearance of a QPO, and low coronal temperature ($kT_{e}=8_{-3}^{+8}$ 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. |
| title | Multi-wavelength observations of a jet launch in real time from the post-changing-look Active Galaxy 1ES 1927+654 |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2501.02340 |