Statistics – Computation
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985azh....62..475z&link_type=abstract
(Astronomicheskii Zhurnal, vol. 62, May-June 1985, p. 475-481) Soviet Astronomy (ISSN 0038-5301), vol. 29, May-June 1985, p. 277
Statistics
Computation
7
Astronomical Models, Disk Galaxies, Galactic Evolution, Galactic Rotation, Galactic Structure, Mass Ratios, Astronomical Photometry, Computational Astrophysics, Radial Velocity, Radii, Scaling Laws, Spiral Galaxies
Scientific paper
Numerical simulations of thick galactic disks, are described, and the results are compared with the available observational data. The disks comprise 200 interacting mass-points embedded in a halo gravitational field of relative mass M(h)/M(d)=0, 1, 2, and 3, respectively. At the beginning of the simulations, the disks had an exponential density distribution within the radius R; at the end of the simulation, the velocity dispersions c(z), c(r), and the c(z)/c(r) ratio diminished with radial distance r. In models with M(h)/M(d) greater than or equal to 1, the disk half-thickness Delta was independent of r, as observed. It is found that although Delta increase when M(h) becomes smaller, it remains smaller than M(h) even in the case M(h)=0. Comparison of model estimates with the observed ratio Delta/L (L being the disk scale factor) showed that the models having M(d)/M(h) less than or equal to 2 are closely fitted by spiral galaxies. In massive halo systems, the layer of diffuse matter may be as thick as the stellar disk.
Morozov A. G.
Zasov Anatoli V.
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