Mathematics – Logic
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203..569l&link_type=abstract
Astrophysical Journal, vol. 203, Feb. 1, 1976, pt. 1, p. 569-580.
Mathematics
Logic
38
Galactic Clusters, Intergalactic Media, X Ray Sources, Adiabatic Conditions, Astronomical Models, Cosmology, Galactic Evolution, Hubble Diagram, Radiant Flux Density, Thermal Conductivity, Universe
Scientific paper
Numerical solutions to the problem of infall of matter into clusters of galaxies are presented. It is assumed that the universe can be described by a Friedmann cosmological model with a Hubble constant 50 km/s/Mpc. It is found that physically reasonable models having a deceleration parameter of 1/2 lead to excessive X-ray emission from clusters of galaxies. Models including a heat flux due to thermal conduction, heating of the intracluster medium by galaxy motions, and a gas outflow from the galaxies in the cluster are discussed, and the results are compared with the observational data in both the X-ray and radio bands. It is concluded that the density parameter must be less than 0.2 in order that the predicted X-ray emission not exceed that observed. No models have been found which give a good description of the observed cluster X-ray sources, with the exception of a fully adiabatic model in a high-density universe.
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