Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100..194c&link_type=abstract
Astronomy and Astrophysics, vol. 100, no. 1, July 1981, p. 194-196. Research supported by the Consiglio Nazionale delle Ricerch
Astronomy and Astrophysics
Astrophysics
42
Astronomical Models, Cosmic Gases, Galactic Clusters, Intergalactic Media, X Ray Sources, Brightness Distribution, Early Stars, Stellar Envelopes, Stellar Mass Ejection
Scientific paper
A static model which incorporates the effects of localized heating is proposed to describe the hot, diffuse gas found within clusters of galaxies. In contrast to the conventional polytropic assumption, the present model considers the gas ejected by early star formation to surround the parent galaxy in a halo or expanding shell until it collides with a similar shell or the ambient intercluster medium, with heating comparatively localized in time and space. The model is consistent with observed X-ray brightness distributions for the A2319 and Coma clusters, and predicts an increase in temperature with radial distance to be accompanied by a nonmonotonic variation of the velocity dispersion with a central minimum.
Cavaliere Alfonso
Fusco-Femiano Roberto
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