Statistics – Computation
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasj...42..517y&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 42, no. 4, 1990, p. 517-532. Research supported by MOESC.
Statistics
Computation
1
Computational Astrophysics, Galactic Nuclei, Molecular Clouds, Spiral Galaxies, Angular Velocity, Astronomical Models, Equations Of Motion, Evolution (Development)
Scientific paper
The dynamical evolution of giant molecular clouds (GMCs) in the galactic disk was numerically studied based upon the assumption that the disk is infinitesimally thin. It has been found that the GMCs lose energy and angular momentum through dynamical friction due to disk stars in nonlinear epicyclic motion, causing the GMCs to spiral into the galactic nucleus. Their infall velocities have a minimum value at a galactocentric distance of 5 kpc. GMCs thus assemble from the outer regions, form a ring distribution within a time scale of 10 to the 9th yr, and remain for a long time within that region. After the GMCs pass through this region very slowly, they fall into the galactic nucleus with relatively high velocities.
Tatematsu Yoshinori
Yasutomi Makoto
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