Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..145f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 145-165.
Astronomy and Astrophysics
Astrophysics
14
Cooling Flows (Astrophysics), Galactic Clusters, Galactic Evolution, Intergalactic Media, Cosmic Gases, X Ray Astronomy
Scientific paper
Hydrodynamical models of the intracluster gas (ICG) are used to investigate the role played by various factors in the formation and evolution of cooling flows, with emphasis on heat conduction. Mass removal by thermal instabilities is investigated. The sink has substantial effects, as it can avoid the central collapse of the ICG and explains the apparent decrease of the mass flow rate toward the center of the flow. Heat conduction in the context of mass removal is also examined. The cooling flows obtained are generally nonsteady, so that the determination of mass removal from the X-ray data using steady state models may, in some cases, overestimate the true mass removal rate, particularly when buoyancy effects are included. The models predict that some cooling flows might have been much more massive in the past, so that large amounts of gas might have been incorporated into a central dominant galaxy at the center of a flow with just modest accretion rates at present.
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