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The analysis of the spiral structurein the galaxies of the Frei sample

Published online by Cambridge University Press:  22 December 2003

C. Boily ,
P. Patsis ,
S. Portegies ,
R. Spurzem ,
C. Theis ,
C. García-Gómez ,
C. Barberá  and
E. Athanassoula
C. García-Gómez
Affiliation:
Univ. Rovira i Virgili, Tarragona, Spain
C. Barberá
Affiliation:
Univ. Rovira i Virgili, Tarragona, Spain
E. Athanassoula
Affiliation:
Observatoire de Marseille, France
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Abstract

We use a Fourier analysis method to study the spiral structure of the discgalaxies in the Frei et al. (1996) sample. We show that m=1components are more often associated with asymmetries between the twoarms of an m=2 spiral than with global lopsidedness of the disc. Thepower in the m=2 components is correlated with the arm class. Themajority of galaxies with arm class 9 or 12 show clear signs ofmodulation in their spiral arms, suggesting the action of anamplification mechanism like the Swing amplification. Finally we report new detections of underlying large-scale bisymmetric components in flocculent spiral galaxies.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 10: JENAM 2002, Galactic & Stellar Dynamics , 2003 , pp. 67
Copyright
© EAS, EDP Sciences, 2003

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