X-ray study of NGC 1399 in the Fornax cluster of galaxies

Details X-ray study of NGC 1399 in the Fornax cluster of galaxies X-ray study of NGC 1399 in the Fornax cluster of galaxies

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384l...5i&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 384, Jan. 1, 1992, p. L5-L8.

Astronomy and Astrophysics

Astronomy

31

Galactic Clusters, Galactic Radiation, Intergalactic Media, X Ray Astronomy, Abundance, Emission Spectra, Energy Spectra, Iron, Line Spectra, Spectrum Analysis

Scientific paper

Observations 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.

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