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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Suzaku and multi-wavelength observations of OJ 287 during the periodic optical outburst in 2007
Publications of the Astronomical Society of Japan, Volume 61, No. 5, Year 2009
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Description
Suzaku observations of the blazar OJ 287 were performed in 2007 April 10-13 and November 7-9. They correspond to a quiescent and a flaring state, respectively. The X-ray spectra of the source can be well-described with single power-law models in both exposures. The derived X-ray photon index and the flux density at 1 keV were found to be Γ = 1.65 ± 0.02 and S 1 keV = 215 ± 5 nJy in the quiescent state. In the flaring state, the source exhibited a harder X-ray spectrum (Γ = 1.50±0.01) with a nearly doubled X-ray flux density of S1 keV = 404 +6-5nJy. Moreover, significant hard X-ray signals were detected up to ∼27 keV. In cooperation with Suzaku, simultaneous radio, optical, and very-high-energy γ-ray observations of OJ 287 were performed with the Nobeyama Millimeter Array, the KANATA telescope, and the MAGIC telescope, respectively. The radio and optical fluxes in the flaring state (3.04±0.46 Jy and 8.93 ± 0.05 mJy at 86.75 Hz and in the V-band, respectively) were found to be higher by a factor of 2-3 than those in the quiescent state (1.73 ± 0.26 Jy and 3.03 ± 0.01 mJy at 86.75 Hz and in the V-band, respectively). No notable γ-ray events were detected in either observation. The spectral energy distribution of OJ 287 indicated that the X-ray spectrum was dominated by inverse Compton radiation in both observations, while synchrotron radiation exhibited a spectral cutoff at around the optical frequency. Furthermore, no significant difference in the synchrotron cutoff frequency was found between the quiescent and flaring states. According to a simple synchrotron self-Compton model, the change of the spectral energy distribution is due to an increase in the energy density of electrons with small changes of both the magnetic field strength and the maximum Lorentz factor of electrons. © 2009. Astronomical Society of Japan.
Authors & Co-Authors
Tashiro, Makoto S.
Japan, Saitama
Saitama University
Arai, Akira
Japan, Higashihiroshima
Hiroshima University
Kohno, Kotaro
Japan, Tokyo
The University of Tokyo
Nakanishi, Kouichirou
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Sasada, Mahito
Japan, Higashihiroshima
Hiroshima University
Shimajiri, Yoshito
Japan, Tokyo
The University of Tokyo
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Tosaki, Tomoka
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Uemura, Makoto
Japan, Higashihiroshima
Hiroshima University
Antonelli, Lucio Angelo
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Antoranz, Pedro
Spain, Madrid
Universidad Complutense de Madrid
Backes, Michael
Germany, Dortmund
Technische Universität Dortmund
Baixeras, Cármen
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Balestra, Silvia
Spain, Madrid
Universidad Complutense de Madrid
Barrio, Juan Abel
Spain, Madrid
Universidad Complutense de Madrid
Bastieri, D.
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Becerra González, Josefa
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Becker, Julia K.
Germany, Dortmund
Technische Universität Dortmund
Bednarek, Włodzimierz
Poland, Lodz
University of Lodz
Berger, Karsten
Poland, Lodz
University of Lodz
Bernardini, Elisa
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Biland, Adrian
Switzerland, Zurich
Eth Zürich
Bock, Rudolf K.
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Bonnoli, Giacomo
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Bordas, Pol
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Bosch-Ramón, Valentí
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Bose, Debanjan
Spain, Madrid
Universidad Complutense de Madrid
Braun, Isabel
Switzerland, Zurich
Eth Zürich
Bretz, Thomas
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Commichau, Sebastian C.
Switzerland, Zurich
Eth Zürich
Contreras, José Luis
Spain, Madrid
Universidad Complutense de Madrid
Cortina, J.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
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 Los Reyes, Raquel R.
Spain, Madrid
Universidad Complutense de Madrid
De Lotto, Barbara
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Domínguez, A. D.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Dorner, Daniela
Switzerland, Zurich
Eth Zürich
Doro, Michele
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Elsässer, Dominik
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Errando, Manel
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Ferenc, Daniela
United States, Davis
University of California, Davis
Fernández, Enrique W.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Firpo, Roger
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Fonseca, M. V.
Spain, Madrid
Universidad Complutense de Madrid
Font, Ll L.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Galante, Nicola
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Garczarczyk, Markus
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Gaug, Markus
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Goebel, Florian
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Hadasch, Daniela
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Hayashida, Masaaki
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
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
Hsu, C. C.
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Jogler, Tobias
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Kranich, Daniel
Switzerland, Zurich
Eth Zürich
La Barbera, Antonino
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Laille, Alvin
United States, Davis
University of California, Davis
Lombardi, Saverio
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Longo, Francesco
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Lorenz, Eckhart
Switzerland, Zurich
Eth Zürich
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Majumdar, Pratik
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
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, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Martínez, Manel
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Mazin, Daniel
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Meucci, Mario
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Meyer, Markus
Germany, Wurzburg
Julius-maximilians-universität Würzburg
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
Moles, Mariano
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Moralejo, Abelardo
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Nieto, Daniel
Spain, Madrid
Universidad Complutense de Madrid
Nilsson, Kari
Finland, Turku
Turun Yliopisto
Otte, Adam Nepomuk
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
United States, Santa Cruz
University of California, Santa Cruz
Oya, Igor
Spain, Madrid
Universidad Complutense de Madrid
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
Pascoli, Donatella
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Pauss, Felicitas
Switzerland, Zurich
Eth Zürich
Pegna, Raffaello G.
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Pérez-Torres, M. A.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Persic, Massimo
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Osservatorio Astronomico Di Trieste
Peruzzo, Luigi
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Prada, Francisco
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Prandini, Elisa
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Rhode, Wolfgang
Germany, Dortmund
Technische Universität Dortmund
Ribó, Marc
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Rico, Javier R.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Spain, Barcelona
Institució Catalana de Recerca I Estudis Avançats
Robert, Arnau
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Saggion, Antonio
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Sánchez-Conde, Miguel A. A.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Scalzotto, Villi
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Schweizer, Thomas
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Shayduk, Maxim
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Shore, Steven N.
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Sillanp̈äa, Aimo K.
Finland, Turku
Turun Yliopisto
Sitarek, Julian
Poland, Lodz
University of Lodz
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Sobczyńska, Dorota
Germany, Wurzburg
Julius-maximilians-universität Würzburg
Spanier, Felix
Switzerland, Zurich
Eth Zürich
Stamerra, Antonio
Finland, Turku
Turun Yliopisto
Stark, Luisa Sabrina
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Takalo, Leo O.
Bulgaria, Sofia
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
Tavecchio, Fabrizio
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Teshima, Masahiro
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Spain, Barcelona
Institució Catalana de Recerca I Estudis Avançats
Tluczykont, Martin
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Torres, Diego F.
Bulgaria, Sofia
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
Turini, Nicola
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Wittek, Wolfgang
Germany, Munich
Max Planck Institute for Physics Werner Heisenberg Institute
Zabalza, Víctor
Spain, Barcelona
Instituto de Estudios Espaciales de Cataluña
Zanin, Roberta
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Statistics
Citations: 33
Authors: 118
Affiliations: 29
Identifiers
Doi:
10.1093/pasj/61.5.1011
ISSN:
00046264
Research Areas
Cancer