Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe.135v&link_type=abstract
"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199
Astronomy and Astrophysics
Astronomy
Scientific paper
We study the spiral arms structure for eight discoidal galaxies with different Elmegreen & Elmegreen class (E&E). The galaxies are NGC514, NGC753, NGC1058, NGC1232, NGC1300, NGC1365, NGC1566 and NGC1637. We analize by means of Fast Fourier Transform CCD images in B or G and I colors, with the aim of describing the perturbation that originates the spiral arms and the stellar formation associated to them. The method, matematically based upon a superposition of one to six armed logarithmic spirals, reveals that: In spite of the two armed components predominance in the Gran Design galaxies (E&E class 12) NGC1300, NGC1365 and NGC1566, assimetric components are needed to describe the whole arm structure. The two arms patern is trailing. The two galaxies with fragmented arms NGC1058 (E&E class 3) and NGC1637 (E&E class 5) show many relevants components, while in the multiple arms galaxies NGC1232, NGC753 and NGC514 (E&E class 9) at least one of the assymetric components is as important as the two armed one. Our method allows also to determine the corrotation resonance (CR). Surprisingly many of the analized galaxies present more than one CR, even among the Grand Design ones, indicating that spiral patterns have not a constant velocity or that different spiral patterns couple to produce the observed arms structure. The two galaxies with fragmented arms show many relevant Fourier components, with many peaks in each of them. Interestingly, the character of the main bissymmetrics component is leading in both cases. This type of analysis will allow to draw a disk potential perturbation to study orbits behavior.
de Carvalho Reinaldo R.
Dottori Horacio
Puerari Ivanio
Vera-Villamizar Nelson
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