Physics – General Physics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrva..40.1976f&link_type=abstract
Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 40, Aug. 15, 1989, p. 1976-1982.
Physics
General Physics
2
Cosmic Gases, Flow Velocity, Gas Flow, Interstellar Matter, Particle Motion, Velocity Distribution, Boltzmann Transport Equation, Doppler Effect, Emission Spectra, Gravitational Effects, Laser Spectroscopy, Quasars
Scientific paper
Velocity distribution functions showing kinematic compression and expansion are derived in the context of gravitational forces. Whereas kinematic compression is well known in laser ion-beam spectroscopy, kinematic expansion is a new concept. In the analysis, collisionless and weak-collision cases are considered. A brief discussion shows that the weak-collision case may be appropriate in certain regions of the interstellar medium and that kinematic compression and expansion could have interesting observational consequences. In particular, kinematic expansion may be important in the formation of broad and asymmetric quasistellar object emission lines.
Field David
Gray Malcolm D.
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