Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215..335p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 215, July 15, 1985, p. 335-340.
Astronomy and Astrophysics
Astrophysics
2
Astronomical Models, Bremsstrahlung, Galactic Clusters, Intergalactic Media, X Ray Sources, Brightness Distribution, Cooling Flows (Astrophysics), Hydrostatics, Interstellar Gas, Isothermal Processes, Kinetic Energy
Scientific paper
The standard 'hydrostatic-isothermal' model of cluster X-ray sources is fitted to numerical X-ray surface brightness distributions from isothermal gas trapped in a cluster of galaxies obeying the r exp 1/4 law. It is found that discrepancies can arise between the fitted values of the parameter beta (the ratio of the kinetic energy/unit mass of the galaxies to the energy/unit mass of the gas), and those calculated from simulated spectroscopic observations of the X-ray gas temperature and the clusters' central line-of-sight velocity dispersion. These discrepancies are similar to those encountered in the Einstein cluster survey of Jones and Forman (1984) although not as large. If clusters do follow the r exp 1/4 law, many more clusters will possess cooling flows than previous 'hydrostatic-isothermal' fits have indicated.
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