Long term multi-wavelength analysis of the Flat Spectrum Radio Quasar OP 313
The Flat Spectrum Radio Quasar OP 313, is a high-redshift blazar that was characterized by intense $\gamma$-ray emission starting from November 2023 to March 2024, as observed by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope (Fermi). We present a multi-wavelength analysis covering 15 years of Fermi-LAT observations, from August 2008 to March 2024, to understand the mechanisms involved in particle acceleration inside the jet of this galaxy, and how emitted radiation in different wavelengths is connected. We analyzed a large sample of datasets coming from different facilities and projects to look at the trend in the multi-wavelength light-curves. From these, we identified the 7 most intense $\gamma$-ray flaring periods, and we analyzed each of them to unveil the responsible physical mechanisms. We realized for each of them the photon index versus flux plot in order to identify potential hysteresis patterns, and then, a kinematic study of the VLBA dataset was pursued to see if new knots arose in the jet before or during the 7 flaring periods we see. Finally, we performed an SED modeling for 2 of the 7 flaring periods. From the SED modeling, we found that a photon field coming from the dusty torus outside the jet is responsible for the $\gamma$-ray emission we saw starting from November 2023.
Authors
- A. Kraus (ORCID: https://orcid.org/0000-0002-4184-9372)
- Garrett K. Keating (ORCID: https://orcid.org/0000-0002-3490-146X)
- E. Angelakis (ORCID: https://orcid.org/0000-0001-7327-5441)
- Fausto Casaburo (ORCID: https://orcid.org/0000-0002-2260-9322)
- I. Myserlis (ORCID: https://orcid.org/0000-0003-3025-9497)
- S. Righini (ORCID: https://orcid.org/0000-0001-7332-5138)
- I. Agudo (ORCID: https://orcid.org/0000-0002-3777-6182)
- Ramprasad Rao (ORCID: https://orcid.org/0000-0002-1407-7944)
- N. Marchili (ORCID: https://orcid.org/0000-0002-5523-7588)
- E. Lindfors (ORCID: https://orcid.org/0000-0002-9155-6199)
- Federica Giacchino (ORCID: https://orcid.org/0000-0002-0247-6884)
- F. D’Ammando (ORCID: https://orcid.org/0000-0001-7618-7527)
- S. Loporchio (ORCID: https://orcid.org/0000-0003-4457-5431)
- Mark Gurwell (ORCID: https://orcid.org/0000-0003-0685-3621)
- Alan P. Marscher (ORCID: https://orcid.org/0000-0001-7396-3332)
- Davide Cerasole (ORCID: https://orcid.org/0000-0003-2033-756X)
- A. Lähteenmäki (ORCID: https://orcid.org/0000-0002-0393-0647)
- L. Di Venere (ORCID: https://orcid.org/0000-0003-0703-824X)
- Svetlana G. Jorstad
- Elisabetta Bissaldi
- Marcello Giroletti
- F. Giordano (ORCID: https://orcid.org/0000-0002-8219-2581)
- Merja Tornikoski
- Chiara Bartolini
- A. Tramacere (ORCID: https://orcid.org/0000-0002-8186-3793)
Publication Details
- Published
- 2025-09-23
- DOI
- https://doi.org/10.22323/1.501.0565
- Primary Topic
- Radio Astronomy Observations and Technology
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Smithsonian Institution
- U.S. Department of Energy
- National Aeronautics and Space Administration
- California Institute of Technology
- International Max Planck Research School for Environmental, Cellular and Molecular Microbiology
- Ministry of Education, Culture, Sports, Science and Technology
- Academia Sinica
- Aalto-Yliopisto
- Centre National d’Etudes Spatiales
- Vetenskapsrådet
- Centre National de la Recherche Scientifique
- Istituto Nazionale di Astrofisica
- International Max Planck Research School for Advanced Methods in Process and Systems Engineering
- Smithsonian Astrophysical Observatory
- Japan Aerospace Exploration Agency
- Institut National de Physique Nucléaire et de Physique des Particules