Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395...99m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 395, no. 1, p. 99-112.
Astronomy and Astrophysics
Astrophysics
12
Astronomical Models, Cooling Flows (Astrophysics), Galactic Clusters, Intergalactic Media, X Ray Sources, High Temperature Gases, Hubble Constant, X Ray Astronomy
Scientific paper
Numerical models of cooling flows are used to examine large amounts of hot gas within clusters of galaxies. A basic premise of the models is that cluster ages are not much greater than their initial central cooling times. It is assumed that mass is conserved. Unlike previous studies, the numerical method uses the theory of characteristics, which has several practical and conceptual advantages over standard finite difference techniques. The techniques to observationally obtain values of M-dot are valid, despite the fact that they assume the flows to be in the steady state, which the models determine not to be the case. Observations of M-dot increasing with r need not directly imply mass dropout from the flow, but may also result from dynamical evolution. Because of the acceleration of the evolution with time, the total accreted mass is much smaller than would be inferred from the final value of the accretion rate, such that only about 10 exp 11 solar masses accrete within the inner 50 kpc.
Balbus Steven A.
Murray Stephen D.
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