Parametric Relations of H II Galaxies
The integrated Hβ luminosities of giant H II regions and of H II galaxies can be predicted with accuracy comparable to the observational errors from the velocity widths of their emission-line profiles. In addition, giant H II regions also present a relation between linear size and their emission-line width. Based on the similarity of these relations with those expected for virialized systems, Terlevich and Melnick interpreted the observed supersonic motions as due to the gravitational potential of a complex of gas and stars.
KeywordsStar Formation Velocity Dispersion Linear Size Surface Brightness Elliptical Galaxy
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