NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-16 T03:30:22 PDT
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For refcode 1988A&AS...76..365C:
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1988A&AS...76..365C Analysis of spiral components in 16 galaxies S. Considere and E. Athanassoula Observatoire de Besancon, CNRS UA 040389, 41 bis Avenue de l'Observatoire, F-25044 Besancon Cedex, France Observatoire de Marseille, 2 Place Leverrier, 13248 Marseille Cedex 04, France Received June 16, accepted July 26, 1988 Summary. -A Fourier analysis of the intensity distributions in the plane of 16 spiral galaxies of morphological types from 1 to 7 is performed. The galaxies processed are NGC 300, 598, 628, 2403, 2841, 3031, 3198, 3344, 5033, 5055, 5194, 5247, 6946, 7096, 7217 and 7331. 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 {omega} of the galaxy plane onto the sky plane. Our results, in good agreement with those issued from different usual methods in the literature, are discussed. The decomposition of the deprojected galaxies into individual spiral components reveals that the two-armed component is everywhere dominant. Our pitch angles are then 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. Key words: galaxies: structure of - galaxies: spiral - data analysis - Image processing.
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Please click here for ADS abstract

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