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| Autori principali: | , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2508.01747 |
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| _version_ | 1866918112513753088 |
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| author | Traianou, E. Gomez, J. L. Cho, I. Chael, A. Fuentes, A. Myserlis, I. Wielgus, M. Zhao, G. -Y. Lico, R. Moriyama, K. Dey, L. Bruni, G. Dahale, R. Toscano, T. Gurvits, L. I. Lisakov, M. M. Kovalev, Y. Y. Lobanov, A. P. Pushkarev, A. B. Sokolovsky, K. V. |
| author_facet | Traianou, E. Gomez, J. L. Cho, I. Chael, A. Fuentes, A. Myserlis, I. Wielgus, M. Zhao, G. -Y. Lico, R. Moriyama, K. Dey, L. Bruni, G. Dahale, R. Toscano, T. Gurvits, L. I. Lisakov, M. M. Kovalev, Y. Y. Lobanov, A. P. Pushkarev, A. B. Sokolovsky, K. V. |
| contents | We present space-based very long baseline interferometry observations of the BL Lac type object OJ 287 taken with RadioAstron at 22 GHz on April 25, 2016, in conjunction with a ground array comprising 27 radio telescopes. We detect ground-space fringes at projected baselines extending up to 4.6 Earth diameters, which allowed us to image the jet in OJ 287 with an angular resolution of ~47 μas. Applying an advanced regularized maximum likelihood imaging method, we resolved the innermost jet structure with a complex morphology at a resolution of ~15 μas (~0.1 pc projected distance). For the first time, due to a favorable geometrical position of the jet in tandem with high data quality, we detect multiple sharp bends that form a "ribbon-like" jet structure that extends down to 1 mas. Two-dimensional Gaussian model-fitting reveals regions of the jet with brightness temperatures of more than 10^13 K, indicative of strong Doppler boosting. Polarimetric imaging reveals that the electric vector position angles are predominantly perpendicular to the innermost jet direction, implying a dominant poloidal magnetic field component near the central engine. Complementary multi-epoch Very Long Baseline Array observations at 43 GHz provide a multifrequency view of the jet evolution. Ridgeline analysis of the 43 GHz data shows significant variations in the jet position angle from 2014 to 2017, behavior consistent with a rotating helical jet structure. Finally, we confirm the emergence of a new jet component (B15 or K), which may be associated with the source's first TeV flare, and offer new observational constraints relevant to models involving a supermassive black hole binary. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_01747 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Revealing a ribbon-like jet in OJ 287 with RadioAstron Traianou, E. Gomez, J. L. Cho, I. Chael, A. Fuentes, A. Myserlis, I. Wielgus, M. Zhao, G. -Y. Lico, R. Moriyama, K. Dey, L. Bruni, G. Dahale, R. Toscano, T. Gurvits, L. I. Lisakov, M. M. Kovalev, Y. Y. Lobanov, A. P. Pushkarev, A. B. Sokolovsky, K. V. High Energy Astrophysical Phenomena Astrophysics of Galaxies We present space-based very long baseline interferometry observations of the BL Lac type object OJ 287 taken with RadioAstron at 22 GHz on April 25, 2016, in conjunction with a ground array comprising 27 radio telescopes. We detect ground-space fringes at projected baselines extending up to 4.6 Earth diameters, which allowed us to image the jet in OJ 287 with an angular resolution of ~47 μas. Applying an advanced regularized maximum likelihood imaging method, we resolved the innermost jet structure with a complex morphology at a resolution of ~15 μas (~0.1 pc projected distance). For the first time, due to a favorable geometrical position of the jet in tandem with high data quality, we detect multiple sharp bends that form a "ribbon-like" jet structure that extends down to 1 mas. Two-dimensional Gaussian model-fitting reveals regions of the jet with brightness temperatures of more than 10^13 K, indicative of strong Doppler boosting. Polarimetric imaging reveals that the electric vector position angles are predominantly perpendicular to the innermost jet direction, implying a dominant poloidal magnetic field component near the central engine. Complementary multi-epoch Very Long Baseline Array observations at 43 GHz provide a multifrequency view of the jet evolution. Ridgeline analysis of the 43 GHz data shows significant variations in the jet position angle from 2014 to 2017, behavior consistent with a rotating helical jet structure. Finally, we confirm the emergence of a new jet component (B15 or K), which may be associated with the source's first TeV flare, and offer new observational constraints relevant to models involving a supermassive black hole binary. |
| title | Revealing a ribbon-like jet in OJ 287 with RadioAstron |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2508.01747 |