Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..839t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 195, June 1981, p. 839-851. Research supported by the Cambridge Univers
Astronomy and Astrophysics
Astronomy
207
Chemical Composition, Emission Spectra, H Ii Regions, Intergalactic Media, Line Spectra, Galaxies, Globular Clusters, Gravitational Fields, H Beta Line, Ionized Gases, Luminosity, Metals, Radii, Spectral Line Width, Stellar Evolution, Stellar Systems, Velocity Distribution
Scientific paper
The dynamic and chemical composition of giant extragalactic H II regions is analyzed, and the data pertaining to H-beta luminosities, linear diameters and emission-line profile widths are correlated. Results show that giant H II regions display the same relations between size, luminosity, and velocity dispersion as noted in gravitationally bound stellar systems. The observed emission-line profile widths represent the velocity dispersion of ionized gas clouds moving in the overall gravitational potential of gas and stars, and the integrated luminosities of H II regions are specified by the velocity dispersions and metallicities. It is suggested that the ionizing flux per unit total mass of a burst of star formation is decreasing with increasing metal abundance.
Melnick Jorge
Terlevich Robert
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