Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8435234m&link_type=abstract
Presented at the Conf. on Non Thermal and Very High Temp. Phenomena in X-Ray Astronomy, Rome, Dec. 1983
Astronomy and Astrophysics
Astrophysics
Galactic Clusters, Luminosity, X Ray Spectra, Bremsstrahlung, Brightness, Cooling Flows (Astrophysics), Heao 1, Intergalactic Media, Spatial Resolution, X Ray Astronomy, X Ray Spectroscopy
Scientific paper
The X-ray emission from luminous clusters of galaxies is dominated by thermal bremsstrahlung from an intergalactic medium. The central density of the gas is strongly correlated with the X-ray surface brightness. The X-ray surface brightness S(sigma) of many clusters is well modeled by a law of the form S(sigma) alpha S(o) 1 + R(2)/A(2) to the minus 3 beta + 1/2 power with beta approximately equal to 0.66. However, this model does not fit the X-ray spectral or optical galaxy counts well. In clusters with cooling flows in their center there is a strong correlation between the cooling rates of X-ray emitting material and optical H alpha emission. It is not clear, at present, what percentage of the virial mass of the cluster is in hot gas but if beta = 0.66, it is possible for the values to be of the order of 1/2. Spatially resoled X-ray spectroscopy is necessary to determine this value with any accuracy.
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