EAS Publications Series
Volume 10, 2003JENAM 2002, Galactic & Stellar Dynamics
|Page(s)||67 - 67|
|Published online||22 December 2003|
C. Boily, P. Patsis, S. Portegies Zwart, R. Spurzem and C. Theis (eds)
EAS Publications Series, 10 (2003) 67
The analysis of the spiral structure in the galaxies of the Frei sample
Univ. Rovira i Virgili, Tarragona, Spain
2 Observatoire de Marseille, France
We use a Fourier analysis method to study the spiral structure of the disc galaxies in the Frei et al. (1996) sample. We show that m=1 components are more often associated with asymmetries between the two arms of an m=2 spiral than with global lopsidedness of the disc. The power in the m=2 components is correlated with the arm class. The majority of galaxies with arm class 9 or 12 show clear signs of modulation in their spiral arms, suggesting the action of an amplification mechanism like the Swing amplification. Finally we report new detections of underlying large-scale bisymmetric components in flocculent spiral galaxies.
© EAS, EDP Sciences, 2003
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