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Fourier Analysis of Spiral Tracers. A Progress Report

Published online by Cambridge University Press:  04 August 2017

S. Considère  and
E. Athanassoula
S. Considère
Affiliation:
Observatoire de Besançon
E. Athanassoula
Affiliation:
Observatoire de Besançon

Extract

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Fourier analysis of the observed distribution of spiral tracers (e.g. HII regions) can yield a wealth of information about the spiral structure of a given galaxy. A description of the method has been given by Kalnajs (1975) and, in brief, involves decomposing the observed distribution into components with given angular periodicity m. Component m = 0 corresponds to the axisymmetric part, m = 1 to either a one-armed spiral or an asymmetry, m = 2 to a spiral or a bar, etc. Each component is then analysed into a superposition of logarithmic spirals. This does not imply that the observed spirals are assumed to be logarithmic, but rather that logarithmic spirals are convenient building blocks.

Type
II. Spiral Structure
Information
Symposium - International Astronomical Union , Volume 100: Internal Kinematics and Dynamics of Galaxies , 1983 , pp. 155 - 156
Copyright
Copyright © Reidel 1983 

References

Considère, S. and Athanassoula, E.: 1982, Astron. Astrophys. 111, 28.Google Scholar
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Hodge, P.W.: 1982, Astron. J. 87, 1341.Google Scholar
Kalnajs, A.J.: 1975, in “La dynamique des galaxies spirales”, ed. Weliachew, L., p. 103.Google Scholar
Kormendy, J. and Norman, C.: 1979, Astrophys. J. 233, 539.Google Scholar
Toomre, A.: 1981, in “Structure and Evolution of Normal Galaxies”, ed. Fall, S.M. and Lynden-Bell, D., Cambridge, p. 111.Google Scholar