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Title:
Suzaku Observations of the Centaurus Cluster: Absence of Bulk Motions in the Intracluster Medium
Authors:
Ota, Naomi; Fukazawa, Yasushi; Fabian, Andrew C.; Kanemaru, Takehiro; Kawaharada, Madoka; Kawano, Naomi; Kelley, Richard L.; Kitaguchi, Takao; Makishima, Kazuo; Matsushita, Kyoko; Murase, Kouichi; Nakazawa, Kazuhiro; Ohashi, Takaya; Sanders, Jeremy S.; Tamura, Takayuki; Urata, Yuji
Affiliation:
AA(Cosmic Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198) AB(Department of Physical Science, School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526) AC(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK) AD(Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601; Cosmic Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198) AE(Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033) AF(Department of Physical Science, School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526) AG(NASA/Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA) AH(Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033) AI(Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033; Cosmic Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198) AJ(Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601) AK(Department of Physics, Saitama University, Shimo-Okubo, Urawa, Saitama 338-8570) AL(Institute of Space and Astronautical Science (ISAS/JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510) AM(Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397) AN(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK) AO(Institute of Space and Astronautical Science (ISAS/JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510) AP(Department of Physics, Saitama University, Shimo-Okubo, Urawa, Saitama 338-8570)
Publication:
Publications of the Astronomical Society of Japan, Vol.59, No.SP1, pp.351-359 (PASJ Homepage)
Publication Date:
01/2007
Origin:
PASJ
Keywords:
galaxies: clusters: individual (Centaurus cluster), X-rays: galaxies: clusters, X-rays: ISM
Bibliographic Code:
2007PASJ...59S.351O

Abstract

The Centaurus cluster (z=0.0104) was observed with the X-ray Imaging Spectrometer (XIS) onboard the Suzaku X-ray satellite in three pointings, one centered on the cluster core and the other two offset by ±8' in declination. To search for possible bulk motions of the intracluster medium, the central energy of a He-like Fe K line (at a rest-frame energy of 6.7keV) was examined to look for a positional dependence. Over spatial scales of 50kpc to 140kpc around the cluster core, the central line energy was found to be constant within a calibration error of 15eV. The 90% upper limit on the line-of-sight velocity difference is |Δv| < 1400 km s-1, giving a tighter constraint than previous measurements. The significant velocity gradients inferred from a previous Chandra study were not detected between two pairs of rectangular 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. The mean redshift of the intracluster medium was determined to be 0.0097, in agreement with the optical redshift of the cluster within the calibration uncertainty. Implications of the present results for estimating the cluster mass are briefly discussed.
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