Volume 400, Number 2, March III 2003
|Page(s)||421 - 428|
|Published online||03 March 2003|
The nature of arms in spiral galaxies *
II. The sample
INAOE, 72000 Puebla, Mexico
2 Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
3 Departamento de Astrofísica, Facultad de Física, Universidad de La Laguna, 38071 La Laguna, Tenerife, Spain
Corresponding author: M. S. del Río, email@example.com
Accepted: 7 October 2002
We present here the results of an imaging study of eight grand-design and two intermediate-arm galaxies, based on CCD observations in U, B, V, R and I. We give grey-scale images, both in individual and in colour indices. Also we present a decomposition into bulge and disc following an iterative method. This provides us with a reasonable estimate of the bulge size and disc scale length, and shows the disc deviation from an exponential law, which can be interpreted as due to the long-term star formation caused by the spiral arms. To evaluate the contribution of the spiral arms to the disc luminosity distribution, with the aid of a mask we have decomposed each image into two parts: arms (which include bulge and nucleus, and eventually bars) and inter-arms (which include the outer disc). In subsequent papers in this series (del Río & Cepa [CITE], hereafter Paper III; del Río & Cepa [CITE], hereafter Paper IV) the data presented here are used to analyse the spiral structure of the galaxies of the sample, using the methods of Beckman & Cepa ([CITE], hereafter Paper I) and the Fourier transform method to find the different symmetry degrees.
Key words: galaxies: spiral / galaxies: structure
© ESO, 2003
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