Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-13
Mon.Not.Roy.Astron.Soc.370:1612-1622,2006
Astronomy and Astrophysics
Astrophysics
12 pages, 12 figures, MNRAS in press. High resolution simulation and further tests added, extended discussion, main conclusion
Scientific paper
10.1111/j.1365-2966.2006.10599.x
We study the formation of disks via the cooling flow of gas within galactic haloes using smoothed particle hydrodynamics simulations. These simulations resolve mass scales of a few thousand solar masses in the gas component for the first time. Thermal instabilities result in the formation of numerous warm clouds that are pressure confined by the hot ambient halo gas. The clouds fall slowly onto the disk through non-spherical accretion from material flowing preferentially down the angular momentum axis. The rotational velocity of the infalling cold gas decreases as a function of height above the disk, closely resembling that of the extra-planar gas recently observed around the spiral galaxy NGC 891.
Kaufmann Tobias
Mayer Lucio
Moore Ben
Stadel Joachim
Wadsley James
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