Suzaku observation of two ultraluminous X-ray sources in NGC 1313
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概要
- 論文の詳細を見る
Two ultraluminous X-ray sources (ULXs) in the nearby Sb galaxy NGC 1313, named X-1 and X-2, were observed with Suzaku on 2005 September 15. During the observation for a net exposure of 28 ks (but over a gross time span of 90 ks), both objects varied in intensity by about 50%. The 0.4–10 keV X-ray luminosities of X-1 and X-2 were measured as 2.5×1040 ergs-1 and 5.8×1039 ergs-1, respectively, with the former exhibiting the highest ever reported for this ULX. The spectrum of X-1 can be explained by the sum of a strong and variable powerlaw component with a high-energy cutoff, and a stable multicolor blackbody with an innermost disk temperature of ∼ 0.2keV. These results suggest that X-1 was in a “very high" state, where disk emission is strongly Comptonized. The absorber within NGC 1313 toward X-1 is suggested to have a subsolar oxygen abundance. The spectrum of X-2 is best represented, in its fainter phase, by a multicolor blackbody model with an innermost disk temperature of 1.2–1.3 keV, and becomes flatter as the source becomes brighter. Hence, X-2 is interpreted to be in a slim-disk state. These results suggest that the two ULXs have black hole masses of some dozens to a few hundred of solar masses.
- 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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KATAOKA Jun
Department of Physics, Faculty of Science, Tokyo Institute of Technology
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UEDA Yoshihiro
Department of Astronomy, Kyoto University
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EBISAWA Ken
Institute of Space and Astronautical Science, JAXA
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KOKUBUN Motohide
Department of High Energy Astrophysics, Institute of Space and Astronautical Science Aerospace Explo
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MAKISHIMA Kazuo
Department of Physics, University of Tokyo
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MIYAWAKI Ryohei
Department of Physics, University of Tokyo
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Matsuoka M
Iss Science Project Office Isas Jaxa
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Done Chris
Department Of Physics Durham University
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MUSHOTZKY Richard
Astrophysics Science Division, NASA/GSFC, Code 662, X-ray Astrophysics
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MATSUSHITA Kyoko
Department of Physics, Tokyo University of Science
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TAKAHASHI Hiromitsu
Department of Physics, Hiroshima University
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MIZUNO Tsunefumi
Department of Physics, Hiroshima University
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KUBOTA Aya
Department of Electronic Information Systems, Shibaura Institute of Technology
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HABA Yoshito
Department of Particle and Astrophysics, Nagoya University
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Haba Yoshito
Department Of Physics Hiroshima University
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Namiki Masaaki
Department Of Earth And Space Science Graduate School Of Science Osaka University
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Morimoto Kouji
Ri Beam Science Laboratory The Institute Of Physical And Chemical Research Research (riken)
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ISOBE Naoki
The Institute of Physical and Chemical Research (RIKEN)
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KUBOTA Aya
The Institute of Physical and Chemical Research (RIKEN)
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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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Ebisawa K
Jaxa Kanagawa
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Ebisawa Ken
Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency (isas/jaxa)
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Morii Mikio
Tokyo Inst. Technol. Tokyo
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Isobe Naoki
Kyoto Univ. Kyoto
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Namiki Masaaki
Osaka Univ. Osaka
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Mushotzky R
Astrophysics Science Division Nasa/gsfc Code 662 X-ray Astrophysics
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Ueda Y
Kyoto Univ. Kyoto
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PETRE Robert
NASA Goddard Space Flight Center
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Petre R
Astrophysics Science Division Nasa Goddard Space Flight Center
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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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Kokubun M
Institute Of Space And Astronautical Science
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DEWANGAN Gulab
Department of Physics, Carnegie Mellon University
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KUBOTA Aya
Institute of Physical and Chemical Research (RIKEN)
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MIYAMOTO Masao
Department of Physics, Tokyo University of Science
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WINTER Lisa
Exploration of the Universe Division, NASA Goddard Space Flight Center
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GRIFFITHS Richard
Department of Physics, Carnegie Mellon University
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MUSHOTZKY Richard
Exploration of the Universe Division, NASA Goddard Space Flight Center
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PETRE Robert
Exploration of the Universe Division, NASA Goddard Space Flight Center
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TAMAGAWA Toru
The Institute of Physical and Chemical Research (RIKEN)
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TERASHIMA Yuichi
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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Makishima Kazuo
Department Of Physics School Of Science The University Of Tokyo
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KUBOTA Aya
RIKEN
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MUSHOTZKY Richard
NASA, Goddard Space Flight Center
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Griffiths Richard
Department Of Physics Carnegie Mellon University
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Winter Lisa
Exploration Of The Universe Division Nasa Goddard Space Flight Center
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PETRE Robert
Code 662, NASA Goddard Space Flight Center
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Hyodo Yoshiaki
Department Of Physics Graduate School Of Science Kyoto University
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Petre R
Laboratory For High Energy Astrophysics Nasa/gsfc
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Ebisawa Ken
Nasa Goddard Space Flight Center
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Ebisawa Ken
Laboratory For High Energy Astrophysics Nasa/gsfc
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Ueda Yoshihiro
Department Of Applied Biological Chemistry The University Of Tokyo
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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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Mushotzky R
Nasa Goddard Space Flight Center
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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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Ishikawa Nobuyuki
Department Of Physics And Mathematics Aoyama Gakuin University
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Mizuno Tsunefumi
Department Of Physical Science Hiroshima University
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Terashima Yuichi
Institute Of Space And Astronautical Science
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Kokubun Motohide
Department Of High Energy Astrophysics Institute Of Space And Astronautical Science Aerospace Explor
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Matsushita Kyoko
Department Of Physics Tokyo University Of Science
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Matsuoka Masaru
Inst. Physical And Chemical Res. (riken) Saitama
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Mitani Takefumi
Department Of Physical Science Hiroshima University
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Done C
Department Of Physics Durham University
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Kubota A
Department Of Electronic Information Systems Shibaura Institute Of Technology
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Kubota Aya
Institute Of Physical And Chemical Research
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Dewangan Gulab
Department Of Physics Carnegie Mellon University
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Miyamoto Masao
Department Of Electro-photooptics Engineering Faculty Of Engineering Tokai University
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Nobukawa Masayoshi
Department Of Physics Graduate School Of Science Kyoto University
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Tawara Y
Department Of Physics School Of Science The University Of Tokyo
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Kokubun Motohide
Ri Beam Science Laboratory The Institute Of Physical And Chemical Research Research (riken)
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Haba Yoshito
Department Of High Energy Astrophysics Institute Of Space And Astronautical Science Japan Aerospace
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Naitou Masataka
Department Of Physics Nagoya University
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Takahashi Hiromitsu
Department Of Biosphere-geosphere Systems Faculty Of Informatics Okayama University Of Science
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Namiki Masaaki
Department Of Physics Graduate School Of Science Osaka University
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Miyawaki Ryohei
Department Of Physics The University Of Tokyo
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Matsuoka M
The Institute Of Physical And Chemical Research (riken)
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Tamagawa Toru
Department Of Geoscience Joetsu University Of Education
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Matsushita Kyoko
Department Of Ophthalmology Okayama University Graduate School Of Medicine Dentistry & Pharmaceu
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Tozuka Miyako
Department Of Physical Science Hiroshima University
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Tsujimoto Masahiro
Institute Of Space And Astronautical Science
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KOKUBUN Motohide
Institute of Space and Astronautical Science (ISAS), JAXA
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Miyawaki Ryohei
Department of Physics, The University of Tokyo
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Mushotzky Ricard
Exploration of the Universe Division, NASA Goddard Space Flight Center
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Ebisawa Ken
Department of Space Science Information Analysis, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)
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Hyodo Yoshiaki
The Institute of Space and Astronautical Science (ISAS), Japan Aerospace and eXpoloration Agency (JAXA)
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Done Chris
Department of Physics, Durham University
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KUBOTA Aya
ISAS/JAXA
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NAMIKI Masaaki
Department of Earth & Space Science, Osaka University
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KATAOKA Jun
Tokyo I. Tech.
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