Density studies on giant extragalactic H II regions
We report the results of a systematic study on the spatial variation of the electron density in a selected group of bright giant H II complexes in the galaxies M 101, M 51, and NGC 6822. Density values for the ionized gas of the regions have been obtained from the forbidden S II 6717/6731 ratio, using long-slit spectrophotometry at high spectral
Castaneda, H. O. et al.
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1992