Other
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..397f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 195, May 1981, p. 397-427.
Other
19
Absorption Spectra, Astronomical Spectroscopy, Quasars, Spectral Line Width, Acceleration (Physics), Astronomical Models, Gas Spectroscopy, Isothermal Processes, Optical Thickness, Shock Wave Propagation
Scientific paper
An intrinsic model for the formation of narrow absorption-line systems in QSO spectra presented in previous papers is further developed. Here, the dynamics of the shell under the action of the radiative driving and the downstream piston are examined. The assumption is made that the swept-up gas behaves isothermally and that the radiative acceleration is proportional to the gas density. It is noted that these assumptions require that the spectrum of the central source be rather flat in the UV. A positive pressure gradient is found to develop in the shell as the downstream piston pressure decays, an effect which is amplified by the density-dependent radiation force. A velocity gradient is simultaneously set up in the shell. The flow is shown to be subject to radiatively driven instabilities, and the production of multiple systems by these means is demonstrated to be plausible.
Dyson John E.
Falle Sam A. E. G.
Perry Jonathan
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