Giant H II regions as distance indicators. I - Relations between global parameters for the local calibrators

Details Giant H II regions as distance indicators. I - Relations between global parameters for the local calibrators Giant H II regions as distance indicators. I - Relations between global parameters for the local calibrators

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..849m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, June 15, 1987, p. 849-866.

Astronomy and Astrophysics

Astronomy

80

H Beta Line, H Ii Regions, Nebulae, Spectral Correlation, Spectral Line Width, Abundance, Distance, Gas Ionization, Radii, Statistical Analysis, Supersonic Flow, Turbulence Models

Scientific paper

The correlations among integrated parameters of giant H II regions, H-beta luminosity, emission-line width, sigma, core radius, and oxygen abundance are studied on the basis of a new homogeneous sample of data for 22 giant nebulae in 10 galaxies with known distances. Correlations are found which provide a powerful distance indicator for galaxies with giant H II regions. The various mechanisms that may generate supersonic gas motions are discussed. It is found that the 'virial-turbulence' model proposed by Terlevich and Melnick (1983) explains best, although not completely, the existence of supersonic motions in the ionized gas and the observed correlations. It is shown that the observations are not consistent with a Kolmogoroff-like turbulence and that energy is fed at all spatial frequencies into the turbulent motions.

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