Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...76..365c&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 76, no. 3, Dec. 1988, p. 365-404. Research supported by the
Astronomy and Astrophysics
Astrophysics
58
Galactic Structure, Spiral Galaxies, Fourier Analysis, Galactic Radiation, Image Processing, Inclination, Position (Location)
Scientific paper
A Fourier analysis of the intensity distributions in the plane of 16 spiral galaxies of morphological types from 1 to 7 is performed. The method, mathematically based upon a decomposition of a distribution into a superposition of individual logarithmic spiral components, is first used to determine for each galaxy the position angle PA and the inclination ω of the galaxy plane onto the sky plane. The results are in good agreement with those issued from different usual methods in the literature. The two-armed component is everywhere dominant. The pitch angles are compared to the previously published ones and their quality is checked by drawing each individual logarithmic spiral on the actual deprojected galaxy images. Finally, the surface intensities for angular periodicities of interest are calculated. A choice of a few of the most important ones is used to elaborate a composite image well representing the main spiral features observed in the deprojected galaxies.
Athanassoula Evangelia
Considere Suzanne
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