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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Magic discovery of very high energy emission from the FSRQ PKS1222+21
Astrophysical Journal Letters, Volume 730, No. 1 PART II, Article L8, Year 2011
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Description
Very high energy (VHE) γ-ray emission from the flat spectrum radio quasar (FSRQ) PKS1222+21 (4C21.35, z = 0.432) was detected with the MAGIC Cherenkov telescopes during a short observation (0.5hr) performed on 2010 June 17. The MAGIC detection coincides with high-energy MeV/GeV γ-ray activity measured by the Large Area Telescope (LAT) on board the Fermi satellite. The VHE spectrum measured by MAGIC extends from about 70GeV up to at least 400GeV and can be well described by a power-law dN/dE E -Γ with a photon index Γ = 3.75 0.27stat 0.2syst. The averaged integral flux above 100GeV is (4.6 0.5) × 10-10 cm-2 s-1 (1 Crab Nebula flux). The VHE flux measured by MAGIC varies significantly within the 30 minute exposure implying a flux doubling time of about 10 minutes. The VHE and MeV/GeV spectra, corrected for the absorption by the extragalactic background light (EBL), can be described by a single power law with photon index 2.72 0.34 between 3GeV and 400GeV, and is consistent with emission belonging to a single component in the jet. The absence of a spectral cutoff constrains the γ-ray emission region to lie outside the broad-line region, which would otherwise absorb the VHE γ-rays. Together with the detected fast variability, this challenges present emission models from jets in FSRQs. Moreover, the combined Fermi/LAT and MAGIC spectral data yield constraints on the density of the EBL in the UV-optical to near-infrared range that are compatible with recent models. © 2011. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Aleksíc, Jelena
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Antonelli, Lucio Angelo
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Antoranz, Pedro
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Backes, Michael
Germany, Dortmund
Technische Universität Dortmund
Barrio, Juan Abel
Spain, Madrid
Universidad Complutense de Madrid
Bastieri, D.
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
Becerra González, Josefa
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Bednarek, Włodzimierz
Poland, Lodz
University of Lodz
Berdyugin, Andrei V.
Finland, Turku
Turun Yliopisto
Berger, Karsten
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Bernardini, Elisa
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Biland, Adrian
Switzerland, Zurich
Eth Zürich
Blanch, Oscar
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Bock, Rudolf K.
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Bonnoli, Giacomo
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Braun, Isabel
Switzerland, Zurich
Eth Zürich
Bretz, Thomas
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Switzerland, Lausanne
École Polytechnique Fédérale de Lausanne
Carosi, Alessandro
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Colin, Pierre
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Colombo, E.
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Contreras, José Luis
Spain, Madrid
Universidad Complutense de Madrid
Cortina, J.
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Covino, Stefano
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Dazzi, Francesco
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
De Angelis, Alessandro D.
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
De Lotto, Barbara
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Doert, Marlene
Germany, Dortmund
Technische Universität Dortmund
Domínguez, A. D.
Spain, Madrid
Consejo Superior de Investigaciones Científicas
Dominis-Prester, Dijana
Croatia, Split
University of Split
Dorner, Daniela
Switzerland, Zurich
Eth Zürich
Doro, Michele
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Elsässer, Dominik
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Ferenc, Daniela
Croatia, Split
University of Split
Fonseca, M. V.
Spain, Madrid
Universidad Complutense de Madrid
Font, Ll L.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Fruck, Christian
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
García López, Ramón J.
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Garczarczyk, Markus
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Giavitto, Gianluca
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Godinović, Nikola
Croatia, Split
University of Split
Hadasch, Daniela
Spain, Barcelona
Csic - Instituto de Ciencias Del Espacio Ice
Herrero Davó, Artemio Alonso
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Hildebrand, Dorothée
Switzerland, Zurich
Eth Zürich
Hose, Juergen
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Hrupec, Dario
Croatia, Split
University of Split
Jogler, Tobias
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Klepser, Stefan
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
La Barbera, Antonino
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Lelas, Damir
Croatia, Split
University of Split
Lindfors, Elina J.
Finland, Turku
Turun Yliopisto
Lombardi, Saverio
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
López-Moya, Marcos
Spain, Madrid
Universidad Complutense de Madrid
Lorenz, Eckhart
Switzerland, Zurich
Eth Zürich
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Makariev, M. V.
Bulgaria, Sofia
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
Maneva, Galina M.
Bulgaria, Sofia
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
Mankuzhiyil, Nijil
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Mannheim, Karl
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Maraschi, Laura
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Mariotti, M.
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
Martínez, Manel
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Mazin, Daniel
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Meucci, Mario
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Mirzoyan, Razmik G.
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Miyamoto, Hiroko
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Moldón, Javier
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Moralejo, Abelardo
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Nieto, Daniel
Spain, Madrid
Universidad Complutense de Madrid
Nilsson, Kari
Finland, Turku
Turun Yliopisto
Oya, Igor
Spain, Madrid
Universidad Complutense de Madrid
Paneque, David
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Paoletti, Riccardo
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Paredes, Josep Maria
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Pasanen, Mikko
Finland, Turku
Turun Yliopisto
Pauss, Felicitas
Switzerland, Zurich
Eth Zürich
Pérez-Torres, M. A.
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Persic, Massimo
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Osservatorio Astronomico Di Trieste
Peruzzo, Luigi
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
Pilia, Maura
Italy, Varese
Università Degli Studi Dell'insubria
Prada, Francisco
Spain, Madrid
Consejo Superior de Investigaciones Científicas
Prada Moroni, Pier Giorgio
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
Prandini, Elisa
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
Puljak, Ivica
Croatia, Split
University of Split
Reinthal, Riho
Finland, Turku
Turun Yliopisto
Rhode, Wolfgang
Germany, Dortmund
Technische Universität Dortmund
Ribó, Marc
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Rico, Javier R.
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Spain, Barcelona
Institució Catalana de Recerca I Estudis Avançats
Saggion, Antonio
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
Scalzotto, Villi
Spain, Madrid
Universidad Complutense de Madrid
Schweizer, Thomas
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
Shayduk, Maxim
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Shore, Steven N.
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Sillanp̈äa, Aimo K.
Italy, Rome
Istituto Nazionale Di Fisica Nucleare - Infn
Sitarek, Julian
Finland, Turku
Turun Yliopisto
Sobczyńska, Dorota
Poland, Lodz
University of Lodz
Spanier, Felix
Poland, Lodz
University of Lodz
Spiro, Susanna
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Stamerra, Antonio
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Takalo, Leo O.
Finland, Turku
Turun Yliopisto
Tavecchio, Fabrizio
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Terzić, Tomislav
Croatia, Split
University of Split
Teshima, Masahiro
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Tibolla, Omar
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Torres, Diego F.
Spain, Barcelona
Csic - Instituto de Ciencias Del Espacio Ice
Spain, Barcelona
Institució Catalana de Recerca I Estudis Avançats
Treves, Aldo
Italy, Varese
Università Degli Studi Dell'insubria
Zabalza, Víctor
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Zanin, Roberta
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Buson, Sara
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Statistics
Citations: 295
Authors: 107
Affiliations: 28
Identifiers
Doi:
10.1088/2041-8205/730/1/L8
ISSN:
20418205
Research Areas
Environmental