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ASCA observation of three bright early-type galaxies: NGC 4472, NGC 4406, and NGC 4636We report Advanced Satellite for Cosmology and Astrophysics (ASCA) 0.3-10 keV and X-ray observations of three early type galaxies, NGC 4472, NGC 4406, and NGC 4636. The extended mission in these galaxies is well described by thin thermal eimssion from hot gas. The gas temperature is 0.92 +/- 0.02 keV for NGC 4472, 0.79 +/- 0.01 keV for NGC 4406, and 0.73 +/- 0.02 keV for NGC 4636. The metal abundance for NGC 4472, NGC 4406, and NGC 4636 are, under the assumption of solar ratios, 0.63 +/- 0.15, 0.45 +/- 0.10, and 0.38 +/- 0.07, respectively. Detailed analysis has allowed determination of the abundances of oxygen, silicon, sulfur, and iron. The observed abundances are consistent with the solar ratios. For NGC 4472 and NGC 4406 we also determined the mean temperature of the gas producing the Si lines from the ratio of the Si H to He-like lines and find it to be consistent with the continuum temperature. The X-ray temperature is in good agreement with the observed optical velocity dispersion, stellar density profile, and gas density profile. Our data indicates that the supernova rate should be less than one fifth of the nominal rate in early type galaxies. We derive the mass of these systems within fixed angular scales and find that M/L greater than 40, confirming that elliptical galaxies are dark matter dominated at large radii.
Document ID
19950033364
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Awaki, Hisamitsu
(Kyoto Univ. Kyoto, Japan)
Mushotzky, Richard
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Tsuru, Takeshi
(Kyoto Univ. Kyoto, Japan)
Fabian, Andrew C.
(Univ. of Cambridge Cambridge, United Kingdom)
Fukazawa, Yasushi
(Univ. of Tokyo Tokyo, Japan)
Loewenstein, Michael
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Makishima, Kazuo
(Univ. of Tokyo Tokyo, Japan)
Matsumoto, Hironori
(Kyoto Univ. Kyoto, Japan)
Matsushita, Kyoko
(Univ. of Tokyo Tokyo, Japan)
Mihara, Tatehiro
(The Institute of Physical and Chemical Research Wako, 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
95A64963
Funding Number(s)
CONTRACT_GRANT: MOESC-05242104
CONTRACT_GRANT: MOESC-05452020
Distribution Limits
Public
Copyright
Other

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