Absence of Bulk Motions of the Intracluster Medium in the Centaurus Cluster(Chapter 2. Thermal Structure/Dynamics of Groups and Clusters of Galaxies, The Extreme Universe in the Suzaku Era)

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概要

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• We present results from the Suzaku observations of a nearby cluster, the Centaurus cluster (z = 0.0104). Three pointing observations of the cluster were carried out with the Suzaku XIS in December 2005, and the Doppler shift of the iron K lines was investigated in detail to constrain the bulk velocity of the intracluster medium (ICM) in its core region. From the spectral analysis, no significant velocity difference was detected within calibration uncertainty of ±700km s^<-1> over a spatial scale of 50kpc in the central 240kpc region. The 90% upper limit on the line-of-sight velocity is<1400km s^<-1>, giving a tighter constraint than the previous measurements. The significant velocity gradients inferred from the previous Chandra observations were not detected in two pairs of regions near the cluster core. These results suggest that the bulk velocity does not largely exceed the thermal velocity of the gas in the central region of the Centaurus cluster. Implications of the present results for the estimation of the cluster mass are discussed.

• 理論物理学刊行会の論文
• 2007-12-19

著者

• FUKAZAWA Yasushi

  Department of Physical Sciences, School of Science, Hiroshima University

• URATA Yuji

  Department of Physics, Saitama University

• KASHIKAWA Nobunari

  National Astronomical Observatory of Japan

• UEDA Yoshihiro

  Department of Astronomy, Kyoto University

• MAKISHIMA Kazuo

  Department of Physics, University of Tokyo

• KELLEY Richard

  NASA/Goddard Space Flight Center

• SANDERS Jeremy

  Institute of Astronomy

• KAWAHARADA Madoka

  Department of Physics, The University of Tokyo

• MATSUSHITA Kyoko

  Department of Physics, Tokyo University of Science

• KITAGUCHI Takao

  Department of Physics, The University of Tokyo

• KAWANO Naomi

  Department of Physical Science, Hiroshima University

• OHASHI Takaya

  Department of Physics, Tokyo Metropolitan University

• Takeshima T

  Department Of Physics Faculty Of Science Kyoto University

• Kelley Richard

  Exploration Of The Universe Division Nasa/goddard Space Flight Center

• Kelley Richard

  Nasa Goddard Space Flight Center

• KELLEY Richard

  NASA, Goddard Space Flight Center

• Kawai N

  National Astronomical Observatory Of Japan Tokyo

• Matsuzaki K

  Department Of Applied Physics University Of Miyazaki

• Fabian A

  Institute Of Astronomy University Of Cambridge

• Tamura Keisuke

  Japan Aerospace Exploration Agency Kanagawa

• Urata Yuji

  Department Of Physics Saitama University

• FABIAN Andy

  Institute of Astronomy, Madingley Road

• FABIAN Andrew

  Institute of Astronomy

• TAMURA Takayuki

  ISAS, JAXA

• OTA Naomi

  Cosmic Radiation Laboratory, RIKEN

• Makishima Kazuo

  Department Of Physics School Of Science The University Of Tokyo

• Ohashi T

  Osaka Prefecture Univ. Osaka

• Ota N

  Department Of High Energy Astrophysics Institute Of Space And Astronomical Science (isas) Japan Aero

• KANEMARU Takehiro

  Department of Physics, Tokyo University of Science

• MURASE Kouichi

  Department of Physics, Saitama University

• NAKAZAWA Kazuhiro

  ISAS, JAXA

• Nakashima Kouichirou

  Nobeyama Radio Observatory

• Urata Yuji

  Academia Sinica Taipei Twn

• Ohashi Takaya

  Department Of Physics Tokyo Metropolitan University

• Fukazawa Y

  Department Of Physical Science Hiroshima University

• Murase Kouichi

  Department Of Applied Physics University Of Miyazaki

• Fukazawa Yasushi

  Department Of Physical Science Hiroshima University

• Kagei T

  Department Of Physics Tokyo Metropolitan University

• Torii Ken'ichi

  The Institute Of Physical And Chemical Research (riken)

• Tamagawa Toru

  Department Of Geoscience Joetsu University Of Education

• Matsushita Kyoko

  Department Of Ophthalmology Okayama University Graduate School Of Medicine Dentistry & Pharmaceu

• Kanemaru Takehiro

  Department Of Physics The University Of Tokyo

• Torii Ken'ichi

  Department Of Astrophysics Nagoya University

• Kato Taichi

  Institute Of Astronomy Graduate School Of Science The University Of Tokyo

• Kawaharada Madoka

  Department Of Physics The University Of Tokyo

• Urata Yuji

  Department Of Astronomy Kyoto University

• MAKISHIMA Kazuo

  Department of Physics, The University of Tokyo:Cosmic Radiation Laboratory, RIKEN

• SANDERS Jeremy

  Institute of Astronomy, Madingley Road

• SANDERS Jeremy

  Institute of Astronomy, Cambridge University

• FABIAN Andrew

  Institute of Astronomy, University of Cambridge

• OTA Naomi

  Institute of Space and Astronautical Science (ISAS, JAXA)

• FABIAN Andy

  Institute of Astronomy

• KANEMARU Takehiro

  Department of Physics, Tokyo University of Science:Department of Physical Science, Hiroshima University

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