First detection of VHE gamma-ray signal from the FSRQ TON 0599
K. AbeTokai University Japanese MAGIC Group: Department of Physics, , Hiratsuka, 259-1292 Kanagawa ,S AbeJapanese MAGIC Group: Institute for Cosmic Ray Research (ICRR), The University of Tokyo , Kashiwa, 277-8582 Chiba ,Jayant AbhirETH Zürich , CH-8093 Zürich ,A AbhishekUniversità di Siena and INFN Pisa , I-53100 Siena ,V A AcciariInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST) , E-08193 Bellaterra (Barcelona) ,A Aguasca-CabotUniversitat de Barcelona, ICCUB, IEEC-UB , E-08028 Barcelona ,I AgudoInstituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n , E-18008 Granada ,T AnielloNational Institute for Astrophysics (INAF) , I-00136 Rome ,Stefano AnsoldiUniversità di Udine and INFN Trieste , I-33100 Udine ,L A AntonelliNational Institute for Astrophysics (INAF) , I-00136 Rome ,A Arbet EngelsMax-Planck-Institut für Physik , D-85748 Garching ,C ArcaroUniversità di Padova and INFN , I-35131 Padova ,K AsanoJapanese MAGIC Group: Institute for Cosmic Ray Research (ICRR), The University of Tokyo , Kashiwa, 277-8582 Chiba ,A BabićCroatian MAGIC Group: University of Zagreb, Faculty of Electrical Engineering and Computing (FER) , 10000 Zagreb ,U Barres de AlmeidaCentro Brasileiro de Pesquisas Físicas (CBPF) , 22290-180 URCA, Rio de Janeiro (RJ) ,J A BarrioInstituto de Astrofísica de Canarias and Dpto. de Astrofísica, Universidad de La Laguna , E-38200 La Laguna, Tenerife ,L Barrios-JiménezInstituto de Astrofísica de Canarias and Dpto. de Astrofísica, Universidad de La Laguna , E-38200 La Laguna, Tenerife ,I BatkovićUniversità di Padova and INFN , I-35131 Padova ,J BaxterJapanese MAGIC Group: Institute for Cosmic Ray Research (ICRR), The University of Tokyo , Kashiwa, 277-8582 Chiba ,J Becerra GonzálezInstituto de Astrofísica de Canarias and Dpto. de Astrofísica, Universidad de La Laguna , E-38200 La Laguna, Tenerife ,Włodzimierz BednarekUniversity of Lodz , Faculty of Physics and Applied Informatics, Department of Astrophysics, 90-236 Lodz ,E. BernardiniUniversità di Padova and INFN , I-35131 Padova ,J BerneteCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas , E-28040 Madrid ,Alessio BertiMax-Planck-Institut für Physik , D-85748 Garching ,J BesenriederMax-Planck-Institut für Physik , D-85748 Garching ,C BigongiariNational Institute for Astrophysics (INAF) , I-00136 Rome ,A BilandETH Zürich , CH-8093 Zürich ,O BlanchInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST) , E-08193 Bellaterra (Barcelona) ,G BonnoliNational Institute for Astrophysics (INAF) , I-00136 Rome ,Ž BošnjakCroatian MAGIC Group: University of Zagreb, Faculty of Electrical Engineering and Computing (FER) , 10000 Zagreb ,E. BronziniNational Institute for Astrophysics (INAF) , I-00136 Rome ,I BurelliInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST) , E-08193 Bellaterra (Barcelona) ,A. Campoy-OrdazDepartament de Física, and CERES-IEEC, Universitat Autònoma de Barcelona , E-08193 Bellaterra ,A CarosiNational Institute for Astrophysics (INAF) , I-00136 Rome ,R CarosiUniversità di Pisa and INFN Pisa , I-56126 Pisa ,M. Carretero-CastrilloUniversitat de Barcelona, ICCUB, IEEC-UB , E-08028 Barcelona ,A J Castro-TiradoInstituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n , E-18008 Granada ,Davide CerasoleINFN MAGIC Group: INFN Sezione di Bari and Dipartimento Interateneo di Fisica dell’Università e del Politecnico di Bari , I-70125 Bari ,G CeribellaMax-Planck-Institut für Physik , D-85748 Garching ,Yating ChaiJapanese MAGIC Group: Institute for Cosmic Ray Research (ICRR), The University of Tokyo , Kashiwa, 277-8582 Chiba ,A CifuentesCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas , E-28040 Madrid ,J L ContrerasUniversidad Complutense de Madrid IPARCOS Institute and EMFTEL Department, , E-28040 Madrid ,J CortinaCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas , E-28040 Madrid ,S CovinoNational Institute for Astrophysics (INAF) , I-00136 Rome ,G D’AmicoUniversity of Bergen Department for Physics and Technology, ,P Da VelaNational Institute for Astrophysics (INAF) , I-00136 Rome ,F DazziNational Institute for Astrophysics (INAF) , I-00136 Rome ,A De AngelisUniversità di Padova and INFN , I-35131 Padova ,B De LottoR de MenezesINFN MAGIC Group: INFN Sezione di Torino and Università degli Studi di Torino , I-10125 Torino ,M DelfinoInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST) , E-08193 Bellaterra (Barcelona) ,J. DelgadoInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST) , E-08193 Bellaterra (Barcelona) ,C Delgado MendezCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas , E-28040 Madrid ,Francesco Di PierroINFN MAGIC Group: INFN Sezione di Torino and Università degli Studi di Torino , I-10125 Torino ,R. Di TriaINFN MAGIC Group: INFN Sezione di Bari and Dipartimento Interateneo di Fisica dell’Università e del Politecnico di Bari , I-70125 Bari ,L Di VenereINFN MAGIC Group: INFN Sezione di Bari and Dipartimento Interateneo di Fisica dell’Università e del Politecnico di Bari , I-70125 Bari ,Adhitiya DineshUniversidad Complutense de Madrid IPARCOS Institute and EMFTEL Department, , E-28040 Madrid ,D Dominis PresterCroatian MAGIC Group: University of Rijeka, Faculty of Physics , 51000 Rijeka ,A DoniniNational Institute for Astrophysics (INAF) , I-00136 Rome ,D DornerUniversität Würzburg , D-97074 Würzburg ,Mattia DoroUniversità di Padova and INFN , I-35131 Padova ,Laura EisenbergerUniversität Würzburg , D-97074 Würzburg ,D ElsaesserTechnische Universität Dortmund , D-44221 Dortmund ,Juan EscuderoInstituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n , E-18008 Granada ,L FoffanoNational Institute for Astrophysics (INAF) , I-00136 Rome ,L FontDepartament de Física, and CERES-IEEC, Universitat Autònoma de Barcelona , E-08193 Bellaterra ,S FröseTechnische Universität Dortmund , D-44221 Dortmund ,S FukamiETH Zürich , CH-8093 Zürich ,Y FukazawaJapanese MAGIC Group: Physics Program, Graduate School of Advanced Science and Engineering, Hiroshima University , 739-8526 Hiroshima ,Markus GarczarczykDeutsches Elektronen-Synchrotron (DESY) , D-15738 Zeuthen ,S GasparyanArmenian MAGIC Group: ICRANet-Armenia , 0019 Yerevan , ArmeniaM GaugDepartament de Física, and CERES-IEEC, Universitat Autònoma de Barcelona , E-08193 Bellaterra ,J G Giesbrecht PaivaCentro Brasileiro de Pesquisas Físicas (CBPF) , 22290-180 URCA, Rio de Janeiro (RJ) ,N GigliettoINFN MAGIC Group: INFN Sezione di Bari and Dipartimento Interateneo di Fisica dell’Università e del Politecnico di Bari , I-70125 Bari ,F GiordanoINFN MAGIC Group: INFN Sezione di Bari and Dipartimento Interateneo di Fisica dell’Università e del Politecnico di Bari , I-70125 Bari ,P GliwnyUniversity of Lodz , Faculty of Physics and Applied Informatics, Department of Astrophysics, 90-236 Lodz ,N GodinovićCroatian MAGIC Group: University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture (FESB) , 21000 Split ,T GradetzkeTechnische Universität Dortmund , D-44221 Dortmund ,R GrauInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST) , E-08193 Bellaterra (Barcelona) ,D GreenMax-Planck-Institut für Physik , D-85748 Garching ,J G GreenMax-Planck-Institut für Physik , D-85748 Garching ,P GüntherUniversität Würzburg , D-97074 Würzburg ,D. HadaschJapanese MAGIC Group: Institute for Cosmic Ray Research (ICRR), The University of Tokyo , Kashiwa, 277-8582 Chiba ,A. HahnMax-Planck-Institut für Physik , D-85748 Garching ,T HassanCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas , E-28040 Madrid ,Lea HeckmannLaboratoire AstroParticule et CosmologieJ Herrera LlorenteInstituto de Astrofísica de Canarias and Dpto. de Astrofísica, Universidad de La Laguna , E-38200 La Laguna, Tenerife ,D HrupecCroatian MAGIC Group: Josip Juraj Strossmayer University of Osijek , Department of Physics, 31000 Osijek ,R ImazawaJapanese MAGIC Group: Physics Program, Graduate School of Advanced Science and Engineering, Hiroshima University , 739-8526 Hiroshima ,D. IsrayelyanArmenian MAGIC Group: ICRANet-Armenia , 0019 Yerevan , ArmeniaI Jiménez MartínezMax-Planck-Institut für Physik , D-85748 Garching ,J Jiménez QuilesInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST) , E-08193 Bellaterra (Barcelona) ,J JormanainenUniversity of Turku Finnish MAGIC Group: Finnish Centre for Astronomy with ESO, Department of Physics and Astronomy, , FI-20014 Turku ,S. KankkunenUniversity of Turku Finnish MAGIC Group: Finnish Centre for Astronomy with ESO, Department of Physics and Astronomy, , FI-20014 Turku ,D. KerszbergInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology (BIST) , E-08193 Bellaterra (Barcelona) ,M. KhachatryanArmenian MAGIC Group: ICRANet-Armenia , 0019 Yerevan , ArmeniaJulius KonradTechnische Universität Dortmund , D-44221 Dortmund ,P M KouchUniversity of Turku Finnish MAGIC Group: Finnish Centre for Astronomy with ESO, Department of Physics and Astronomy, , FI-20014 Turku ,H KuboJapanese MAGIC Group: Institute for Cosmic Ray Research (ICRR), The University of Tokyo , Kashiwa, 277-8582 Chiba ,Junko KushidaTokai University Japanese MAGIC Group: Department of Physics, , Hiratsuka, 259-1292 Kanagawa ,
ABI
Аннотация
ABSTRACT TON 0599 (z = 0.7247) belongs to the few flat spectrum radio quasars (FSRQs) detected in the very high energy (VHE, $E > 100$ GeV) gamma-ray band. Its redshift makes it currently one of the farthest VHE gamma-ray sources. It was detected for the first time with the MAGIC telescopes on 2017 December 15, and observed until December 29. The flux reached a maximum of about 50 per cent of the Crab Nebula flux above 80 GeV on the second night of observation, after which we witnessed a gradual decrease of the flux. The VHE gamma-ray spectrum connects smoothly to the one in the high energy ($E > 100$ MeV) band obtained from simultaneous observations with Fermi-LAT. It features a cut-off at energies around 50 GeV, indicating the location of the gamma-ray emission zone beyond the broad line region. In addition, we were able to follow the spectral evolution during the fading phase of the flare. Multiwavelength analysis based on observations in optical, near-infrared, and radio bands acquired by the Whole Earth Blazar Telescope Collaboration from November to March, as well as observations in X-ray and optical–UV bands with instruments on board the Swift satellite, shows strong correlation between different bands. We model the broadband emission with a simple one-zone leptonic model, where the high-energy peak is predominantly produced by external Compton scattering of photons from the dusty torus.
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