Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........10w&link_type=abstract
Ph.D. Thesis Queens Univ., Kingston (Ontario). Dept. of Physics.
Astronomy and Astrophysics
Astrophysics
1
Cooling Flows (Astrophysics), Elliptical Galaxies, Galactic Clusters, Star Formation, Turbulence, Cooling, Fluid Dynamics, Galactic Evolution, Gas Streams, Intergalactic Media, Mathematical Models
Scientific paper
The first turbulent models of cooling flows in both elliptical galaxies and clusters of galaxies are presented. The effects of turbulence are modelled by parameters describing the turbulent viscosity and the turbulent heat conduction. The star-forming cooling condensates are removed via a prescription involving characteristic turbulent time scales. Comparisons of turbulent and laminar models highlight the turbulent effects. In particular, turbulent models have higher velocities and smaller temperature gradients over the flow than do laminar models. These result in distinct observational signatures which can be used to determine the role played by turbulence in cooling flows. Aside from the turbulent parameters, the gravitational potential is the most important factor in the models. Models of particular galaxies and clusters indicate that, because of the shallow gravitational potential in clusters, turbulence dominates in cluster cooling flows, while having a much smaller effect on flows with steeper and deeper potentials such as seen in isolated elliptical galaxies. The predictions derived from these calculations are timely in view of the data soon expected from the new generation of X-ray telescopes.
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