Statistics – Computation
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232..447j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 2, June 1990, p. 447-466. Research supported by DFG.
Statistics
Computation
13
Computational Astrophysics, Interstellar Matter, Stellar Systems, Adiabatic Flow, Dissipation, Gravitation Theory, Interstellar Gas, Landau Damping, Perturbation Theory, Spatial Distribution
Scientific paper
The ISM fluctuations (IFs) induced by the pointlike structure of the stellar system are investigated theoretically, applying a hydrodynamic analysis approach. The basic equations are derived, and the time dependence and spatial structure of the IFs are analyzed, with particular attention to the adiabatic flow, the effect of self-gravitation, heating and cooling, quasi-linear approximations of the dynamical friction, the rate of change of momentum density in the IFs, and Landau damping. It is shown that the IFs are strongly affected by gas dissipation phenomena, and that IFs can be accurately represented by linearized equations over long time spans and an ample range of wavenumbers.
Just Andreas
Kegel Wilhelm H.
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