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Date and Time of the Query: 2019-05-20 T18:24:50 PDT
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For refcode 2003A&A...400..421D:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2003A&A...400..421D The nature of arms in spiral galaxies II. The sample M. S. del Rio, J. Cepa 1 - INAOE, 72000 Puebla, Mexico 2 - Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain 3 - Departamento de Astrofisica, Facultad de Fisica, Universidad de La Laguna, 38071 La Laguna, Tenerife, Spain Received 13 February 1998 / Accepted 7 October 2002 Abstract. 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, Rand 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 Rio & Cepa 1998, hereafter Paper III; del Rio & Cepa 1999, 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 (1990, hereafter Paper I) and the Fourier transform method to find the different symmetry degrees. Key words: galaxies: spiral - galaxies: structure
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