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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.22403 |
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| _version_ | 1866915980627673088 |
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| author | Paraschos, Georgios F. Liodakis, Ioannis Jorstad, Svetlana Kovalev, Yuri Y. Chakraborty, Sudip Marin, Frederic Ehlert, Steven R. Traianou, Efthalia Debbrecht, Lena C. Agudo, Ivan Barnouin, Thibault Casey, Jacob J. Di Gesu, Laura Kaaret, Philip Kim, Dawoon E. Kislat, Fabian Ratheesh, Ajay Saade, M. Lynne Tombesi, Francesco Marscher, Alan Gomez, Jose-Luis Pushkarev, Alexander B. Savolainen, Tuomas Myserlis, Ioannis Gurwell, Mark Keating, Garrett Rao, Ramprasad Kang, Sincheol Lee, Sang-Sung Kim, Sanghyun Cheong, Whee Yeon Jeong, Hyeon-Woo Song, Chanwoo Li, Shan Nam, Myeong-Seok Alvarez-Ortega, Diego Casadio, Carolina Chen, Chien-Ting Costa, Enrico Churazov, Eugene Ferrazzoli, Riccardo Galanti, Giorgio Khabibullin, Ildar O'Dell, Stephen L. Pacciani, Luigi Roncadelli, Marco Roberts, Oliver J. Soffitta, Paolo Swartz, Douglas A. Tavecchio, Fabrizio Weisskopf, Martin C. Zhuravleva, Irina |
| author_facet | Paraschos, Georgios F. Liodakis, Ioannis Jorstad, Svetlana Kovalev, Yuri Y. Chakraborty, Sudip Marin, Frederic Ehlert, Steven R. Traianou, Efthalia Debbrecht, Lena C. Agudo, Ivan Barnouin, Thibault Casey, Jacob J. Di Gesu, Laura Kaaret, Philip Kim, Dawoon E. Kislat, Fabian Ratheesh, Ajay Saade, M. Lynne Tombesi, Francesco Marscher, Alan Gomez, Jose-Luis Pushkarev, Alexander B. Savolainen, Tuomas Myserlis, Ioannis Gurwell, Mark Keating, Garrett Rao, Ramprasad Kang, Sincheol Lee, Sang-Sung Kim, Sanghyun Cheong, Whee Yeon Jeong, Hyeon-Woo Song, Chanwoo Li, Shan Nam, Myeong-Seok Alvarez-Ortega, Diego Casadio, Carolina Chen, Chien-Ting Costa, Enrico Churazov, Eugene Ferrazzoli, Riccardo Galanti, Giorgio Khabibullin, Ildar O'Dell, Stephen L. Pacciani, Luigi Roncadelli, Marco Roberts, Oliver J. Soffitta, Paolo Swartz, Douglas A. Tavecchio, Fabrizio Weisskopf, Martin C. Zhuravleva, Irina |
| contents | The location of $γ$-ray creation and emission within extra-galactic jets is a matter of active debate. One particularly well-suited source to pinpoint the location is the nearby, bright radio galaxy 3C 84, harbouring a powerful jet. Here we investigate the origin of $γ$-rays measured during a recent $γ$-ray flare, by analysing the linear polarisation signal of close-in-time very long baseline interferometry (VLBI) observations at centimetre and millimetre wavelengths. While 3C 84 is overall almost unpolarised, we find that close-in-time to the $γ$-ray flare peak regions at parsec-scale distances from the central engine shows a fractional linear polarisation increase. Under the physically well-motivated assumption of a causal relation between this polarisation enhancement and the $γ$-ray flare, and combined with insights from concurrent X-ray polarisation measurements, the $γ$-rays being created in this region is a physically motivated scenario, in a process consistent with synchrotron self-Compton. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_22403 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Where within the 3C 84 jet are $γ$-rays produced? Paraschos, Georgios F. Liodakis, Ioannis Jorstad, Svetlana Kovalev, Yuri Y. Chakraborty, Sudip Marin, Frederic Ehlert, Steven R. Traianou, Efthalia Debbrecht, Lena C. Agudo, Ivan Barnouin, Thibault Casey, Jacob J. Di Gesu, Laura Kaaret, Philip Kim, Dawoon E. Kislat, Fabian Ratheesh, Ajay Saade, M. Lynne Tombesi, Francesco Marscher, Alan Gomez, Jose-Luis Pushkarev, Alexander B. Savolainen, Tuomas Myserlis, Ioannis Gurwell, Mark Keating, Garrett Rao, Ramprasad Kang, Sincheol Lee, Sang-Sung Kim, Sanghyun Cheong, Whee Yeon Jeong, Hyeon-Woo Song, Chanwoo Li, Shan Nam, Myeong-Seok Alvarez-Ortega, Diego Casadio, Carolina Chen, Chien-Ting Costa, Enrico Churazov, Eugene Ferrazzoli, Riccardo Galanti, Giorgio Khabibullin, Ildar O'Dell, Stephen L. Pacciani, Luigi Roncadelli, Marco Roberts, Oliver J. Soffitta, Paolo Swartz, Douglas A. Tavecchio, Fabrizio Weisskopf, Martin C. Zhuravleva, Irina High Energy Astrophysical Phenomena Astrophysics of Galaxies The location of $γ$-ray creation and emission within extra-galactic jets is a matter of active debate. One particularly well-suited source to pinpoint the location is the nearby, bright radio galaxy 3C 84, harbouring a powerful jet. Here we investigate the origin of $γ$-rays measured during a recent $γ$-ray flare, by analysing the linear polarisation signal of close-in-time very long baseline interferometry (VLBI) observations at centimetre and millimetre wavelengths. While 3C 84 is overall almost unpolarised, we find that close-in-time to the $γ$-ray flare peak regions at parsec-scale distances from the central engine shows a fractional linear polarisation increase. Under the physically well-motivated assumption of a causal relation between this polarisation enhancement and the $γ$-ray flare, and combined with insights from concurrent X-ray polarisation measurements, the $γ$-rays being created in this region is a physically motivated scenario, in a process consistent with synchrotron self-Compton. |
| title | Where within the 3C 84 jet are $γ$-rays produced? |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2603.22403 |