H-alpha velocity widths of giant extragalactic H II regions

Details H-alpha velocity widths of giant extragalactic H II regions H-alpha velocity widths of giant extragalactic H II regions

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..624r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. 624-638. Research supported by the National Research

Astronomy and Astrophysics

Astrophysics

72

Astronomical Spectroscopy, H Alpha Line, H Ii Regions, Nebulae, Data Correlation, Diameters, Regression Analysis, Spectral Line Width, Turbulence

Scientific paper

Velocity dispersions have been deduced from H-alpha profiles obtained with a Fabry-Perot interferometer spectrometer in 47 giant H II regions observed in 16 nearby spiral and irregular Magellanic galaxies. The velocity width W is found to be related to the size of the H II region; the relation is significantly different from the prediction of self-gravitation. The mean of the three largest velocity widths of H II regions in a galaxy is closely related to the absolute blue magnitude of the present galaxy. The shape of the relation log D-log W is dependent on the adopted distances to the galaxies. Analysis of detailed velocity maps of two galactic H II regions shows that the internal relationship between the velocity width and linear size is the same as for giant extragalactic regions. A turbulent energy cascade is suggested as the most viable mechanism explaining both the relationship between velocity dispersion and size and that between velocity dispersion and the absolute magnitude of the parent galaxy.

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