Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-07-02
Mon.Not.Roy.Astron.Soc. 294 (1998) 485-488
Astronomy and Astrophysics
Astrophysics
9 pages, 3 figures
Scientific paper
10.1046/j.1365-8711.1998.01336.x
Effects of gravitational softening on the global structure of self-gravitating disks in centrifugal equillibrium are examined in relation to hydrodynamical/gravitational simulations. The one-parameter spline softening proposed by Hernquist & Katz is used. It is found that if the characteristic size of a disk, r, is comparable or less than the gravitational softening length, epsilon, then the cross section of the simulated disk is significantly larger than that of a no-softening (Newtonian) disk with the same mass and angular momentum. We furthermore demonstrate that if r is less than or about epsilon/2 then the scaling relation r proportional to epsilon^3/4 holds for a given mass and specific angular momentum distribution with mass. Finally we compare some of the theoretical results obtained in this and a previous paper with the results of numerical Tree-SPH simulations and find qualitative agreement.
Hellsten Uffe
Sommer-Larsen Jesper
Vedel Henrik
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