Parametric relations of H II galaxies

Details Parametric relations of H II galaxies Parametric relations of H II galaxies

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.205...49t&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 205, no. 1, p. 49-55.

Astronomy and Astrophysics

Astrophysics

24

Dwarf Galaxies, Emission Spectra, H Beta Line, H Ii Regions, Charge Coupled Devices, Magellanic Clouds

Scientific paper

The integrated H-beta 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 (1981) interpreted the observed supersonic motions as due to the gravitational potential of a complex of gas and stars. We show that H II galaxies also present a relation between linear size and their emission-line width, which supports the gravitating model. We also show that the scatter in the luminosity-line width relation for H II galaxies seems to be correlated with linear size and compare the results with the 'fundamental plane' for elliptical galaxies from Dressier et al. (1987).

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