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titleSuzaku and multi-wavelength observations of a super massive binary black hole candidate, OJ 287
Author(jpn)瀬田, 裕美; 磯部, 直樹; 田代, 信; 中西, 康一郎; 笹田, 真人; 島尻, 芳人; 植村, 誠
Author(eng)Seta, Hiromi; Isobe, Naoki; Tashiro, Makoto S.; Nakanishi, Kouichiro; Sasada, Mahito; Shimajiri, Yoshito; Uemura, Makoto; Hayashida, Masaaki; Lindfors, Elina; MAGIC collaboration
Author Affiliation(jpn)埼玉大学大学院理工学研究科; 京都大学理学研究科宇宙物理学教室; 埼玉大学大学院理工学研究科; 野辺山宇宙電波観測所; 広島大学大学院理学研究科物理科学専攻; 野辺山宇宙電波観測所; 広島大学宇宙科学センター
Author Affiliation(eng)Department of Physics, Saitama University; Department of Astronomy, Kyoto University; Department of Physics, Saitama University; Nobeyama Radio Observatory; Department of Physical Science, Hiroshima University; Nobeyama Radio Observatory; Astrophysical Science Center, Hiroshima University; SLAC National Accelerator Laboratory and KIPAC; Tuorla Observatory, University of Turku; MAGIC collaboration
Issue Date2010-02-26
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構特別資料:
JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H
Start page30
End page31
Publication date2010-02-26
AbstractSuzaku observations of the blazar OJ 287 were performed in a quiescent and a flaring state in 2007. The X-ray spectra of the source were well described with single power-law models in both exposures. In the flaring state, the spectrum was harder with significant hard X-ray signals were detected up to approximately 27 keV, and the X-ray flux density was a factor of two higher, compared with that of the quiescent state. In cooperation with the Suzaku, simultaneous radio, optical, and very-high-energy gamma-ray observations were performed with the Nobeyama Millimeter Array, the KANATA telescope, and the MAGIC telescope, respectively. The obtained spectral energy distribution of OJ 287 indicated that the X-ray spectrum was dominated by inverse Compton radiation in both observations, while the synchrotron component exhibited a spectral cutoff around the optical frequency. According to a simple synchrotron self-Compton model, it is estimated that the change of the spectral energy distribution was 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.
DescriptionMeeting Information: The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan
Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science
KeywordsBL Lacertae objects: individual (OJ 287) - radiation mechanisms: non-thermal
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-09-008E

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