| Issue |
EAS Publications Series
Volume 10, 2003
JENAM 2002, Galactic & Stellar Dynamics
|
|
|---|---|---|
| Page(s) | 67 - 67 | |
| DOI | https://doi.org/10.1051/eas:2003132 | |
| 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
1
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