Physics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.186..479l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 186, Feb. 1979, p. 479-490.
Physics
100
Astrodynamics, Interstellar Gas, Kinematics, Stellar Motions, Turbulent Flow, Acceleration (Physics), Gas Dynamics, Stellar Evolution, Velocity Distribution
Scientific paper
Data assembled from a variety of sources show that the velocity dispersion of young stars and cool interstellar gas increases systematically with the size of the region considered, over a wide range of length scales. This causes an increase of stellar velocity dispersion with age for stars observed near the sun, since the older stars originate from a large volume of space. This effect is sufficient to account for the observed age dependence of the velocity dispersion of stars for ages up to about 1 billion yr, implying that secular acceleration is relatively unimportant for the kinematics of the stars. The observed dependence of the gaseous velocity dispersion on region size suggests a turbulent hierarchy of motions in which smaller-scale motions are produced by the turbulent decay of larger-scale ones. Some of the observed large-scale motions, especially those associated with warps of the gas layer, may be driven by gas infall.
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