The nature of arms in spiral galaxies. II. The sample

Details The nature of arms in spiral galaxies. II. The sample The nature of arms in spiral galaxies. II. The sample

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...400..421d&link_type=abstract

Astronomy and Astrophysics, v.400, p.421-428 (2003)

Astronomy and Astrophysics

Astrophysics

1

Galaxies: Spiral, Galaxies: Structure

Scientific paper

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{del1998}, hereafter Paper III; del Río & Cepa \cite{del1999}, 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{Beckman}, hereafter Paper I) and the Fourier transform method to find the different symmetry degrees.
Figures 1 to 4 and Fig. 7 are only available in electronic form at http://www.edpsciences.org}

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