Statistics – Computation
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..439s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. 439-454.
Statistics
Computation
7
Disk Galaxies, Galactic Structure, Gravitational Collapse, Hydrodynamic Equations, Lyman Alpha Radiation, Quasars, Computational Astrophysics, Gas Flow, Gravitational Fields, Red Shift
Scientific paper
A series of numerical calculations has been performed to simulate the hydrodynamic collapse of spheroidal protogalaxies to gaseous disks and to test the hypothesis that high-redshift damped Ly-alpha absorption systems detected in QSO spectra originate in large massive disks of gas which are progenitors of present-day galactic disks. The results indicate that, for a wide range of input parameters, a disklike structure approaches centrifugal equilibrium in less than about 2 Gyr after the start of collapse. The final size of the disks depends on the spin parameter, and for a fixed spin parameter, depends on the core radius of the halo. A specific mechanism for contraction of the centrifugally supported disks is considered, and it is shown how mass shed by an assumed population of halo stars reaches the plane about 1 Gyr after formation of the initial disks. This causes the disk to contract by a factor of more than two after another 1 Gyr.
Chang Allen C.
Schiano V. R. A.
Wolfe Arthur M.
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