Other
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..114v&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 114 (SEE N93-26706 10-90)
Other
Chemical Evolution, Interstellar Matter, Metallicity, Red Shift, Supernova Remnants, Absorption Spectra, Emission Spectra, Galaxies, Optical Thickness
Scientific paper
The large optical depth in absorption of the Ly-alpha line in damped Ly-alpha systems implies that the emission line produced by H2 regions is very broad, since the number of diffusions is very large. The emission lines observed in DLy-alpha systems are narrow, a fact that can only be explained if the emission comes from the outer layers alone, or if the interstellar medium (ISM) is clumpy and multiphase. It is shown how discrete, cold H1 clouds embedded in a hot, fully ionized phase, produce narrow lines. This might provide evidence for a supernova remnant SNR-dominated ISM at high redshift, in agreement with the observed metallicity and chemical evolution models. Other high redshift galaxies also offer evidence for such a multiphase, in homogeneous ISM.
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