Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.278..235m&link_type=abstract
Nature, vol. 278, Mar. 15, 1979, p. 235, 236. Research supported by the U.S. Department of Energy.
Astronomy and Astrophysics
Astronomy
Astronomical Models, Galactic Clusters, X Ray Sources, Binary Stars, Black Holes (Astronomy), Bremsstrahlung, Gravitational Collapse, Interstellar Gas, Quasars, X Ray Binaries
Scientific paper
Models for the source of X-ray emission from galactic clusters are discussed. The first model supposes that the X rays are thermal bremsstrahlung from a hot quasi-isothermal intercluster gas. The hot gas would have to be very old and would have been collisionally heated in the past by such sources as quasars. The second model considers the sources to be many distinct 'galactic type' sources, composed of clusters of black holes with associated gas and galaxies, including a small percentage of black holes in binary association with normal stars and emitting X rays as typical X-ray binaries. The large numbers of black holes required would be remnants of massive stars formed in the early evolution of the universe and responsible for the 2.7 K microwave background radiation, according to the cosmology of Rees (1978). A third model may be proposed as a combination of the first two, in which the black hole clusters are remnants of quasar activity associated with gravitational collapse.
Morley P. D.
Tucker Robin W.
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