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Metal concentration and X-ray cool spectral component in the central region of the Centaurus cluster of galaxiesSpatially resolved energy spectra in the energy range 0.5-10 keV have been measured for the Centaurus cluster of galaxies with Advanced Satellite for Cosmology and Astrophysics (ASCA). Within 10 min (200 kpc) from the cluster center, the helium-like iron K emission line exhibits a dramatic increase toward the center rising from an equivalent width approximately 500 eV to approximately 1500 eV corresponding to an abundance change from 0.3 to 1.0 solar. The presence of strong iron L lines indicates an additional cool component (kT approximately 1 keV) within 10 min from the center. The cool component requires absorption in excess of the galactic value and this excess absorption increases towards the central region of the cluster. In the surrounding region with radius greater than 10 min, the spectra are well described by a single temperature thermal model with kT approximately 4 keV and spatially uniform abundances at about 0.3-0.4 times solar. The detection of metal-rich hot and cool gas in the cluster center implies a complex nature of the central cluster gas which is likely to be related to the presence of the central cD galaxy NGC 4696.
Document ID
19950033362
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fukazawa, Yasushi
(Univ. of Tokyo Tokyo, Japan)
Ohashi, Takaya
(Tokyo Metropolitan University Hachioji, Tokyo, Japan)
Fabian, Andrew C.
(Univ. of Cambridge Cambridge, United Kingdom)
Canizares, Claude R.
(MIT, Cambridge, MA United States)
Ikebe, Yasushi
(Univ. of Tokyo Tokyo, Japan)
Makishima, Kazuo
(Univ. of Tokyo Tokyo, Japan)
Mushotzky, Richard F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Yamashita, Koujun
(Nagoya Univ. Nagoya, Japan)
Date Acquired
August 16, 2013
Publication Date
January 1, 1994
Publication Information
Publication: PASJ: Publications of the Astronomical Society of Japan
Volume: 46
Issue: 3
ISSN: 0004-6264
Subject Category
Astrophysics
Accession Number
95A64961
Distribution Limits
Public
Copyright
Other

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