Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..738b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, June 15, 1990, p. 738-749.
Astronomy and Astrophysics
Astronomy
9
Dark Matter, Interstellar Gas, Lyman Alpha Radiation, Radiation Pressure, Radiation Trapping, Hydrogen, Starburst Galaxies
Scientific paper
The present consideration of whether trapped Ly-alpha radiation could be important in galactic dynamics notes that radiation pressure is unimportant for bound static ionized clouds at spherical system radii of more than 300 pc or flattened system scale heights of over 400 pc; both Ly-alpha galaxies and absorption systems are too large for radiation pressure alone to support them against gravity or external pressure. Velocities at the free-fall speed have negligible effect on results at the densities considered. It is found that radiation trapping can affect the appearance of the Ly-alpha line, either broadening it to mimic a large velocity dispersion or generating a blue wing for the line in the case of systematic cloud contraction.
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