Iron and Nickel Line Diagnostics for the Galactic Center Diffuse Emission
スポンサーリンク
概要
- 論文の詳細を見る
We have observed the diffuse X-ray emission from the Galactic Center (GC) using the X-ray Imaging Spectrometer (XIS) on Suzaku. The high-energy resolution and the low-background orbit provided excellent spectra of the GC diffuse X-rays (GCDX). The XIS found many emission lines in the GCDX near the energy of K-shell transitions of iron and nickel. The most pronounced features are Fe I Kα at 6.4 keV and K-shell absorption edge at 7.1 keV, which are from neutral and/or low ionization states of iron, and the K-shell lines at 6.7 keV and 6.9 keV from He-like (Fe XXV Kα) and hydrogenic (Fe XXVI Lyα) ions of iron. In addition, Kα lines from neutral or low ionization nickel (Ni I Kα) and He-like nickel (Ni XXVII Kα), Fe I Kβ, Fe XXV Kβ, Fe XXVI Lyβ, Fe XXV Kγand FeXXVI Lyγ were detected for the first time. The line center energies and widths of Fe XXV Kα and Fe XXVI Lyα favor a collisional excitation plasma for the origin of the GCDX. The electron temperature determined from the line flux ratio of Fe XXV Kα/Fe XXV Kβ is similar to the ionization temperature determined from that of Fe XXV Kα/Fe XXVI Lyα. Thus it would appear that the GCDX plasma is close to ionization equilibrium. The 6.7 keV flux and temperature distribution to the galactic longitude is smooth and monotonic, in contrast to the integrated point source flux distribution. These facts support the hypothesis that the GCDX is truly diffuse emission rather than the integration of the outputs of a large number of unresolved point sources. In addition, our results demonstrate that the chemical composition of Fe in the interstellar gas near the GC is constrained to be about 3.5 times solar abundance.
- 日本天文学会の論文
- 2007-01-31
著者
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常深 博
大阪大学
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KOYAMA Katsuji
Department of Physics, Kyoto University
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KATAOKA Jun
Department of Physics, Faculty of Science, Tokyo Institute of Technology
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MAEDA Yoshitomo
Institute of Space and Astronautical Science
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YAMASAKI Noriko
Institute of Space and Astronautical Science
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TAKAHASHI Hiromitsu
Department of Physics, Hiroshima University
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MATSUMOTO Hironori
Department of Physics, Kyoto University
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HOLT Stephen
F. W. Olin College of Engineering
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TAKAHASHI Tadayuki
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
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HYODO Yoshiaki
Department of Physics, Graduate School of Science, Kyoto University
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TSUBOI Yohko
Department of Science and Engineering, Chuo University
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NAKAJIMA Hiroshi
Department of Earth and Space Science, Osaka University
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Tsuru Takeshi
Department Of Pathology Kumamoto University School Of Medicine
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HOLT Stephen
Olin College of Engineering
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Murakami Hiroyuki
Japan Aerospace Exploration Agency Institute Of Space And Astronautical Science
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Haba Yoshito
Department Of Physics Hiroshima University
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Yamauchi S
Faculty Of Humanities And Social Sciences Iwate University
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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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Holt S
F. W. Olin College Of Engineering
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Senda Atsushi
Cosmic Radiation Laboratory Institute Of Physical And Chemical Research
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Senda Atsushi
Riken (the Institute Of Physical And Chemical Research)
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Brown Gregory
Exploration Of The Universe Division Nasa/goddard Space Flight Center
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Negoro H
Inst. Physical And Chemical Res. Saitama
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Tsuru Takeshi
Department Of Physics Graduate School Of Science Kyoto University
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YAMAUCHI Shigeo
Faculty of Humanities and Social Sciences, Iwate University
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Koyama Katsuji
Department Of Physics Graduate School Of Science Kyoto University
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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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INUI Tatsuya
Department of Physics, Kyoto University
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SENDA Atsushi
The Institute of Physical and Chemical Research (RIKEN)
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MURAKAMI Hiroshi
PLAIN center, Institute of Space and Astronautical Science, JAXA
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Nakajima Hiroshi
Department Of Earth And Space Science Osaka University
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Inui Tatsuya
Department Of Physics Faculty Of Science Kyoto University
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Inui Tatsuya
Peptide Institute Inc. Protein Research Foundation
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Inui Tatsuya
Department Of Chemistry The College Of Staten Island/cuny
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MAEDA Yoshitomo
ISAS, JAXA
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YAMAZAKI Noriko
Institute of Space and Astronautical Science, JAXA
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BROWN Gregory
High Energy Density Physics and Astrophysics Division, Lawrence Livermore National Laboratory
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SENDA Atsushi
Department of Physics, Kyoto University
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Hyodo Yoshiaki
Department Of Physics Graduate School Of Science Kyoto University
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Yamauchi Shigeo
Faculty Of Humanities And Social Sciences Iwate University
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Maehara Hideo
Kwasan And Hida Observatories Kyoto 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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KATAOKA Jun
Physics Department, Tokyo Institute of Technology
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Yamasaki N
Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency
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Yamasaki Noriko
Department Of Physics School Of Science The University Of Tokyo
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Matsumoto Hironori
Department Of Physics Faculty Of Science Kyoto University
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Maeda Yoshitomo
Institute For Space And Astronautical Science Japan Aerospace Exploration Agency
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Terashima Yuichi
Department Of Physics Ehime 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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Tsuboi Y
Department Of Science And Engineering Chuo University
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Nakajima Hiroshi
Department Of Biochemistry Central Research Institute Maruha Corporation
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Takahashi Hiromitsu
Department Of Biosphere-geosphere Systems Faculty Of Informatics Okayama University Of Science
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Miyoshi Yoshizumi
Solar-terrestrial Environment Laboratory Nagoya University
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Inui Tatsuya
Department Of Physics Kyoto University
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Tsuboi Yohko
Department Of Physics Tokyo Institute Of Technology
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Matsumoto Hironori
Center For Space Research Massachusetts Institute Of Technology
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Kasahara Katsuaki
Department Of System Engineering Shibaura Institute Of Technology
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Tamagawa Toru
Department Of Geoscience Joetsu University Of Education
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Yoshida M
Okayama Astrophysical Observatory Okayama
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Koyama Katsuji
Department Of Astrophysics School Of Science Nagoya University
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Tsuboi Yohko
Department Of Physics Faculty Of Science Kyoto University
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Yokota Takao
Iss Science Project Office Institute Of Space And Astronautical Science Japan Aerospace Exploration
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Matsumoto Hironori
Department Of Obstetrics And Gynecology School Of Medicine Kyorin University
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Nakajima H
Department Of Earth And Space Science Osaka University
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Takahashi Tadayuki
Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency
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Nakajima Hiroshi
Department of Physics, Nihon University
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Inui Tatsuya
Department of Physics, Faculty of Science, Kyoto University
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NAKAJIMA Hiroshi
Department of Physics, Kyoto University
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NAKAJIMA Hiroshi
Department of Physics, Science University of Tokyo
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NAKAJIMA Hiroshi
Department of Allergy and Clinical Immunology, Chiba University Hospital
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YAMADA Shinya
Department of Physics, University of Tokyo
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Hyodo Yoshiaki
The Institute of Space and Astronautical Science (ISAS), Japan Aerospace and eXpoloration Agency (JAXA)
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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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SENDA Atsushi
Cosmic-ray Laboratory, RIKEN
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TAKAHASHI Tadayuki
Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)
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