A long-term multiwavelength study of the flat spectrum radio quasar OP 313
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arXiv
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| Natura: | Preprint |
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2026
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| author | Bartolini, Chiara Lindfors, Elina Tramacere, Andrea Giroletti, Marcello Cerasole, Davide Agudo, Ivan Angelakis, Emmanouil Bissaldi, Elisabetta Casaburo, Fausto D'Ammando, Filippo Di Venere, Leonardo Ramazani, Vandad Fallah Giacchino, Federica Giordano, Fracesco Gurwell, Mark Jormanainen, Jenni Jorstad, Svetlana Keating, Garrett Kouch, Pouya M. Kraus, Alexander Lahteenmaki, Anne Loporchio, Serena Marchili, Nicola Marscher, Alan Myserlis, Ioannis Rao, Ramprasad Righini, Simona Tornikoski, Merja |
| author_facet | Bartolini, Chiara Lindfors, Elina Tramacere, Andrea Giroletti, Marcello Cerasole, Davide Agudo, Ivan Angelakis, Emmanouil Bissaldi, Elisabetta Casaburo, Fausto D'Ammando, Filippo Di Venere, Leonardo Ramazani, Vandad Fallah Giacchino, Federica Giordano, Fracesco Gurwell, Mark Jormanainen, Jenni Jorstad, Svetlana Keating, Garrett Kouch, Pouya M. Kraus, Alexander Lahteenmaki, Anne Loporchio, Serena Marchili, Nicola Marscher, Alan Myserlis, Ioannis Rao, Ramprasad Righini, Simona Tornikoski, Merja |
| contents | The Flat Spectrum Radio Quasar OP 313 is a high-redshift (z = 0.997) blazar that entered an intense gamma-ray active phase from November 2023 to March 2024, as observed by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. We present a multiwavelength analysis covering 15 years of data, from August 2008 to March 2024, to contextualize this period of extreme gamma-ray activity within the long-term emission of the source. We analyzed a long-term, comprehensive, multiwavelength dataset from different facilities and projects from radio to gamma-rays. We identified the 7 most intense gamma-ray flaring periods and performed a kinematic analysis of Very Long Baseline Array (VLBA) data to determine whether new jet components emerged before or during these flares. For 2 of these flaring periods, we performed the modeling of the spectral energy distribution (SED). The VLBA-BU-BLAZAR and MOJAVE datasets reveal a new jet component appearing in both visibility datasets prior to the onset of one of the strongest gamma-ray flares. By comparing the timing of the VLBA-BU-BLAZAR knots ejection with the gamma-ray flaring periods, we constrained the setup of the SED modeling. We also found that the first gamma-ray flaring period is less Compton-dominated than the others. Our results suggest that the recent activity of OP 313 is triggered by new jet components emerging from the core and interacting with a standing shock. The γ-ray emission likely arises from dusty torus photons upscattered via Inverse Compton (IC) by relativistic jet electrons. The SED modeling indicates that this component is less dominant during the first γ-ray flaring period than the later ones. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_12474 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A long-term multiwavelength study of the flat spectrum radio quasar OP 313 Bartolini, Chiara Lindfors, Elina Tramacere, Andrea Giroletti, Marcello Cerasole, Davide Agudo, Ivan Angelakis, Emmanouil Bissaldi, Elisabetta Casaburo, Fausto D'Ammando, Filippo Di Venere, Leonardo Ramazani, Vandad Fallah Giacchino, Federica Giordano, Fracesco Gurwell, Mark Jormanainen, Jenni Jorstad, Svetlana Keating, Garrett Kouch, Pouya M. Kraus, Alexander Lahteenmaki, Anne Loporchio, Serena Marchili, Nicola Marscher, Alan Myserlis, Ioannis Rao, Ramprasad Righini, Simona Tornikoski, Merja High Energy Astrophysical Phenomena The Flat Spectrum Radio Quasar OP 313 is a high-redshift (z = 0.997) blazar that entered an intense gamma-ray active phase from November 2023 to March 2024, as observed by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. We present a multiwavelength analysis covering 15 years of data, from August 2008 to March 2024, to contextualize this period of extreme gamma-ray activity within the long-term emission of the source. We analyzed a long-term, comprehensive, multiwavelength dataset from different facilities and projects from radio to gamma-rays. We identified the 7 most intense gamma-ray flaring periods and performed a kinematic analysis of Very Long Baseline Array (VLBA) data to determine whether new jet components emerged before or during these flares. For 2 of these flaring periods, we performed the modeling of the spectral energy distribution (SED). The VLBA-BU-BLAZAR and MOJAVE datasets reveal a new jet component appearing in both visibility datasets prior to the onset of one of the strongest gamma-ray flares. By comparing the timing of the VLBA-BU-BLAZAR knots ejection with the gamma-ray flaring periods, we constrained the setup of the SED modeling. We also found that the first gamma-ray flaring period is less Compton-dominated than the others. Our results suggest that the recent activity of OP 313 is triggered by new jet components emerging from the core and interacting with a standing shock. The γ-ray emission likely arises from dusty torus photons upscattered via Inverse Compton (IC) by relativistic jet electrons. The SED modeling indicates that this component is less dominant during the first γ-ray flaring period than the later ones. |
| title | A long-term multiwavelength study of the flat spectrum radio quasar OP 313 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2601.12474 |