Other
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..567a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 92, Sept. 1986, p. 567-579. Research supported by the National Research Council of C
Other
25
Astronomical Spectroscopy, H Alpha Line, H Ii Regions, Line Shape, Fabry-Perot Spectrometers, Galactic Nuclei, Radial Velocity, Red Shift, Spectral Line Width, Statistical Distributions
Scientific paper
Integrated H-alpha profiles of 47 giant extragalactic H II regions in 26 nearby galaxies were obtained with a large-aperture Fabry-Perot spectrometer. It is found that 66 percent of the profiles are symmetrical and best fitted with a single Doppler component; the remaining profiles show asymmetries and are best fitted with two or three spectral components. More than half of the single-component H-alpha profiles are better characterized with a de Voigt profile than with a Gaussian profile. The H II region with complex integrated profiles tend to have larger total widths than the H II regions with symmetrical profiles. In two-component line profiles, the weaker component is seen to be more often redshifted with respect to the main component. The heliocentric radial velocities are given with other profile parameters, and the individual profiles are presented. The H-alpha profiles of five isolated extragalactic H II regions and of three galaxy nuclei are also shown and briefly discussed.
Arsenault Robin
ROY Jean-Rene
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