Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382...79c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. 79-81.
Astronomy and Astrophysics
Astrophysics
4
Elliptical Galaxies, Galactic Clusters, Interstellar Gas, X Ray Spectra, Active Galactic Nuclei, Emission Spectra, Heao 2, High Temperature Gases, Luminosity
Scientific paper
X-ray emission from 45 early-type galaxies in Coma is explored using data from the IPC on the Einstein Observatory. Data for a clean subsample of 27 observations of galaxies greater than 13 arcmin from the cluster center yield only upper limits, which are generally larger than those of field ellipticals with similar optical luminosities. The mean galaxy X-ray and blue luminosities for the subsample are less than 2.2 x 10 exp 40 ergs/s and 4.4 x 10 exp 10 solar luminosities, respectively. It is concluded that environmental effects in rich clusters do not enhance the X-ray emission from individual elliptical galaxies. It is argued that the small-scale fluctuations in cluster X-ray surface brightness observed by Soltan and Fabricant (1990) and attributed to a small number of sources with luminosities of about 4 x 10 exp 41 ergs/s are more likely due to AGN than to hot interstellar gas.
Blizzard Paula
Canizares Claude R.
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