Statistics – Computation
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249...13a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, March 1, 1991, p. 13-24.
Statistics
Computation
14
Cooling Flows (Astrophysics), Dark Matter, Galactic Clusters, Nuclear Astrophysics, Astronomical Models, Baryons, Computational Astrophysics, Galactic Evolution, Interstellar Gas
Scientific paper
The consequences of pregalactic and protogalactic cooling flows in the cold dark matter and general hierarchical clustering models are investigated. It is found that such flows are unlikely to process an appreciable fraction of the baryons in the universe into low-mass stars in most models. This is because a significant amount of gas only cools quasi-statistically in clouds for which the mean cooling time, t(c), and free-fall time, t(f), are comparable, whereas one expects most clouds to have t(c) less than t(f) unless significant heating occurs as a result of massive star formation. The one exception is models dominated by nonbaryonic 'warm' dark matter. Here, the first objects to form satisfy t(c) about t(f), so that a substantial fraction of the gas in the universe may cool quasi-statically. For other models it is concluded that a less restrictive analog of cluster cooling flows is required to provide a baryonic solution to the halo dark matter problem.
Ashman Keith M.
Carr Bernard J.
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