Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...93..469p&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 93, no. 3, June 1992, p. 469-493. Research supported by CNPq
Astronomy and Astrophysics
Astrophysics
47
Fourier Analysis, Galactic Structure, H Ii Regions, Image Processing, Spiral Galaxies, Data Reduction, Fourier Transformation, Mathematical Models, Spatial Distribution
Scientific paper
The distribution of H II regions in eleven spiral galaxies is analyzed through 2D Fourier transform following Kalnajs' method (Kalnajs 1975; Considere and Athanassoula 1982, 1988). A first result obtained with this method is the major axis position angle and the inclination of the galaxies. The decomposition of the deprojected H II regions distributions shows that NGC 224 (M 31) is dominated by a one-armed spiral component, NGC 2997 by a three-armed one, and the rest by two-armed spirals. The pattern of the giant and supergiant H II regions, with regard to that of all regions within a given galaxy, is obtained by weighting the position of each region with its respective diameter. A method based on the variation of the pitch angle with the radial distance has been idealized to obtain the leading or trailing character of the arms. The classical relation between arm winding and morphological type is discussed.
Dottori Horácio Alberto
Puerari Ivanio
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