Probing the disk-jet connection of the radio galaxy 3C 120 observed with Suzaku
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概要
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We report on deep (40 ks x 4) observations of the bright broad line radio galaxy 3C 120 using Suzaku. The observations were spaced one week apart, and sampled a range of continuum fluxes. An excellent broadband spectrum was obtained over two decades of frequency (0.6 to 50 keV) within each 40 ks exposure. We clearly resolved the iron K emission-line complex, finding that it consists of a narrow K alpha core (sigma similar or equal to 110 eV or an EW of 60 eV), a 6.9 keV line, and an underlying broad iron line. Our confirmation of the broad line contrasts with the XMM-Newton observation in 2003, where the broad line was not required. The most natural interpretation of the broadline is iron Kline emission from a face-on accretion disk that is truncated at similar to 10 r(g). Above 10 keV, a relatively weak Compton hump was detected (reflection fraction of R similar or equal to 0.6), superposed on the primary X-ray continuum of Gamma similar or equal to 1.75. Thanks to the good photon statistics and low background of the Suzaku data, we clearly confirm the spectral evolution of 3C 120, whereby the variability amplitude decreases with increasing energy. More strikingly, we discovered that the variability is caused by a steep power-law component of Gamma similar or equal to 2.7, possibly related to non-thermal jet emission. We discuss our findings in the context of similarities and differences between radio-loud/quiet objects.
- 2007-04-25
著者
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TASHIRO Makoto
Department of Physics, Saitama University
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KATAOKA Jun
Department of Physics, Faculty of Science, Tokyo Institute of Technology
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TSUBUKU Yoshihiro
Department of Physics, Faculty of Science, Tokyo Institute of Technology
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ARIMOTO Makoto
Department of Physics, Faculty of Science, Tokyo Institute of Technology
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ISOBE Naoki
Cosmic Radiation Laboratory, RIKEN
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Yamagami Takamasa
Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency
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Yamagami Takamasa
Institute Of Space And Astronautical Science
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Yamagami Takamasa
The Institute Of Space And Astronautical Science
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MUSHOTZKY Richard
Astrophysics Science Division, NASA/GSFC, Code 662, X-ray Astrophysics
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TAKAHASHI Tadayuki
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
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Madejski Greg
Stanford Linear Accelerator Center
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WATANABE Shin
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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KOHMURA Takayoshi
Physics Department, Kogakuin University
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Takeshima T
Department Of Physics Faculty Of Science Kyoto University
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Ueno Masaru
Department Of Earth And Space Science Osaka University
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Uchino Masahiro
Osaka Univ. Osaka Jpn
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Kii T
Univ. Miyazaki Miyazaki
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REEVES James
NASA, Goddard Space Flight Center
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TERASHIMA Yuichi
Department of Astrophysics, Nagoya University
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MIHARA Tatehiro
The Institute of Physical and Chemical Research
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Kataoka Jun
Inst. Of Space And Astronautical Sci. 3-1-1 Yoshinodai Sagamihara 229-8510 Jpn
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Kataoka Jun
Department Of Physics Tokyo Institute Of Technology
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Isobe Naoki
Kyoto Univ. Kyoto
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Reeves James
Astrophysics Group School Of Physical And Geographical Sciences Keele University
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Arimoto Makoto
Department Of Physics Tokyo Institute Of Technology
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Arimoto Makoto
Department Of Kansei Engineering Faculty Of Textile Science And Technology Shinshu University
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Tsuru Takeshi
Department Of Physics Graduate School Of Science Kyoto University
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Mushotzky R
Astrophysics Science Division Nasa/gsfc Code 662 X-ray Astrophysics
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Iyomoto N
Exploration Of The Universe Division Nasa/goddard Space Flight Center
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Iyomoto Naoko
The Institute Of Space And Astronautical Science
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Tamura Keisuke
Japan Aerospace Exploration Agency Kanagawa
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Yasuda Tatsuki
Faculty Of Science Kagoshima University
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USHIO Masayoshi
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
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MUSHOTZKY Richard
NASA Goddard Space Flight Center
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Kataoka Jun
Tokyo Institute of Technology
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Yokota T
Foods & Pharmaceuticals Research & Development Laboratory Asahi Breweries Ltd.
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MUSHOTZKY Richard
NASA, Goddard Space Flight Center
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GALLO Luigi
SUPA, Univ. of St Andrews
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MARKOWITZ Alex
NASA Goddard Space Flight Center
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USHIO Masayoshi
ISAS, JAXA
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WATANABE Shin
ISAS, JAXA
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Kato T
Institute Of Astronomy Graduate School Of Science The University Of Tokyo
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Takamizawa K
Vsolj
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Takamizawa Kesao
Variable Star Obsevers League In Japan (vsolj)
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Ueno M
Osaka Univ. Osaka
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IWASAWA Kazushi
Max-Planck-Institut fur extraterestrische Physik
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Kohmura Takayoshi
Department Of Earth And Space Science Graduate School Of Science Osaka University
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Kotoku Jun'ichi
Department Of Physics Faculty Of Science Tokyo Institute Of Technology
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Kotoku Jun'ichi
Department Of Physics Tokyo Institute Of Technology
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Kotoku Jun'ichi
Department Of Physics The University Of Tokyo
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Iwasawa K
Max Planck Institut Fur Extraterrestrische Physik (mpe)
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Mushotzky R
Nasa Goddard Space Flight Center
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IWASAWA Kazushi
Max Planck Institut fur extraterrestrische Physik (MPE)
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MARKOWITZ Alex
NASA, Goddard Space Flight Center
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GALLO Luigi
Max Planck Institut fur extraterrestrische Physik (MPE)
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UENO Masaru
Physics Department, Tokyo Institute of Technology
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KATAOKA Jun
Physics Department, Tokyo Institute of Technology
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Iyomoto Naoko
Department Of Physics The University Of Tokyo
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Mushotzky Richard
Astrophysics Science Division Nasa/gsfc Code 662 X-ray Astrophysics
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Isobe Naoki
Department Of Astronomy Kyoto University
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Ishikawa Nobuyuki
Department Of Physics And Mathematics Aoyama Gakuin University
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Terashima Yuichi
Department Of Physics Ehime University
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Murakami Toshio
Department Of Physics Saitama University
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Yokota T
Faculty Of Agriculture Shizuoka University
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Yuuki T
Asahi Breweries Ltd. Ibaraki Jpn
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Gallo Luigi
Department Of Astronomy And Physics Saint Mary's University
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Tsuboi Y
Department Of Science And Engineering Chuo University
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Markowitz Alex
Center For Astrophysics And Space Sciences University Of California
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Yamagami T
Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency
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Kotani Taro
Department Of Physics Tokyo University Of Science
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Kagei T
Department Of Physics Tokyo Metropolitan University
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Torii Ken'ichi
The Institute Of Physical And Chemical Research (riken)
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Isobe Naoki
Department Of Physics School Of Science The University Of Tokyo
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Tashiro Makoto
Department Of Astronomy And Astrophysics Pennsylvania State University
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Yamagami Takamasa
Institute Of Space And Astronautical Science Jaxa.
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Tamagawa Toru
Department Of Geoscience Joetsu University Of Education
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Tsuboi Yohko
Department Of Physics Faculty Of Science Kyoto University
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Watanabe Shin
Department Of High Energy Astrophysics Institute Of Space And Astronomical Science (isas) Japan Aero
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Torii Ken'ichi
Department Of Astrophysics Nagoya University
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Kato Taichi
Institute Of Astronomy Graduate School Of Science The University Of Tokyo
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Yokota Takao
Iss Science Project Office Institute Of Space And Astronautical Science Japan Aerospace Exploration
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Yamashita Takuya
Graduate School Of Science And Engineering Aoyama Gakuin University
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Takahashi Tadayuki
Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency
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Ueno Masaru
School of Medicine, Hirosaki University
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REEVES James
Astrophysics Group, School of Physical and Geographical Sciences, Keele University
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REEVES James
NASA Goddard Space Flight Center:John Hopkins University
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Watanabe Shin
Department of High Energy Astrophysics, Institute of Space and Astronomical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)
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UENO Masaru
Department of physics, Faculty of Science, Tokyo Institute of Technology
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Gallo Luigi
Department of Astronomy and Physics, Saint Mary's University
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TAKAHASHI Tadayuki
Institute of Space and Astronautical Science (ISAS), JAXA:Department of Physics, The University of Tokyo
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TSUBOI Yohko
Department of Physics, Faculty of Science and Engineering, Chuo University
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KATAOKA Jun
Tokyo I. Tech.
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WATANABE Shin
Institute of Space and Astronautical Science (ISAS), JAXA
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TAKAHASHI Tadayuki
Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)
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Arimoto Makoto
Department of Kansei Eneineerine. Faculty of Textile Science and Techoolopr, Shinslia Unitersity
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