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X-ray study of NGC 1399 in the Fornax cluster of galaxiesObservations of the cD galaxy NGC 1399 in the Fornax cluster of galaxies with Ginga have detected extended X-ray emission out to a radius of more than about 360 kpc. The energy spectrum of this emission is well fitted with an optically thin thermal spectrum with kT = 1.46 +0.05/-0.21 keV with a strong iron emission line corresponding to an iron abundance of 1.1 +1.3/-0.5 times solar. The mass of the hot gas responsible for X-ray emission is nearly the same as the total stellar mass of the cluster. Therefore the presence of iron at near-solar abundance suggests that the mass of the hot gas ejected from galaxies is comparable to the total stellar mass. This result indicates that most of the hot gas in a very poor cluster is created through ejections from galaxies, rather than being primordial.
Document ID
19920036714
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ikebe, Y.
(Tokyo Univ. Japan)
Ohashi, T.
(Tokyo Univ. Japan)
Makishima, K.
(Tokyo Univ. Japan)
Tsuru, T.
(Tokyo, University Japan)
Fabbiano, G.
(Tokyo Univ. Japan)
Kim, D.-W.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Trinchieri, G.
(Arcetri Osservatorio Astrofisico, Florence, Italy)
Hatsukade, I.
(Miyazaki University Japan)
Yamashita, K.
(Tokyo Univ. Japan)
Kondo, H.
(Institute of Space and Astronautical Science Sagamihara, Japan)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 384
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
92A19338
Funding Number(s)
CONTRACT_GRANT: NAG8-801
Distribution Limits
Public
Copyright
Other

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