Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407l..13h&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 407, no. 1, p. L13-L15.
Astronomy and Astrophysics
Astrophysics
13
Cooling Flows (Astrophysics), Cosmic X Rays, Galactic Clusters, Galactic Evolution, Stellar Luminosity, Cosmology, Galactic Mass, Galactic Radiation, Star Distribution, Stellar Temperature
Scientific paper
Cooling flow formation and evolution within the context of cluster formation and evolution is discussed. Analysis of X-ray emission from bimodal clusters was used to investigate cooling in the center of clusters. Bimodal clusters represent an observable evolutionary stage in hierarchical cluster formation. The clusters studied all had long cooling times and comparison with the frequency of clusters with short cooling times suggests a significant lack of cooling in bimodal clusters. Results indicate that the formation of a cooling flow may occur late in the formation of a rich cluster. It is suggested that cooling flows form after the merger of separate cluster atmospheres but before galactic relaxation to a smooth distribution. The relaxation time serves as an upper limit to the time scale for the formation of a cooling flow.
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