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Detections of hard X-ray emissions from bright early-type galaxies with ASCAFive bright elliptical galaxies in the Virgo Cluster, NGC 4365, NGC 4374 (M84), NGC 4406 (M86), NGC 4472 (M49), and NGC 4636, were observed with ASCA. In addition to the extended thermal X-ray emission of temperature kT approximately 1 keV, harder X-rays with color temperature kT greater than or equal to 2 keV were detected from all of them. The 2-10 keV luminosities of this hard component for the five galaxies, integrated within 5 min, are distributed within a relatively narrow range of (1-4) x 10(exp 40) ergs/s. The hard X-ray component is primarily attributed to the integrated emission from discrete X-ray sources. In NGC 4406 and NGC 4374 the data indicate that the hard component is contributed additionally by foreground/background emission from the hot intracluster medium (ICM) of the Virgo Cluster. The hard component of NGC 4472 seems also contributed by the Virgo ICM emission, but in this case there is evidence that the ICM brightness is locally enhanced within approximately 10 min of NGC 4472.
Document ID
19950036858
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Matsushita, K.
(University of Tokyo Tokyo, Japan)
Makishima, K.
(University of Tokyo Tokyo, Japan)
Awaki, H.
(Kyoto University Kyoto, Japan)
Canizares, C. R.
(Massachusetts Institute of Technology, Cambridge, MA United States)
Fabian, A. C.
(University of Cambridge Cambridge, United Kingdom)
Fukazawa, Y.
(University of Tokyo Tokyo, Japan)
Loewenstein, M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Matsumoto, H.
(Kyoto University Kyoto, Japan)
Mihara, T.
(Institute of Physical and Chemical Research Saitama, Japan)
Mushotzky, R. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
November 20, 1994
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 436
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A68457
Distribution Limits
Public
Copyright
Other

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