NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-27 T05:33:28 PDT
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For refcode 1992A&A...257...85P:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1992A&A...257...85P Multiband analysis of the surface brightness distributions of Sb and Sc spirals from CCD images II. Bulge-disc decomposition M. Prieto, J. E. Beckman, J. Cepa, and A.M. Varela Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, Spain Received April 18,1990; accepted September 12, 1991 Abstract. In this paper we analyze the structure of a small sample of galaxies, using a set of CCD images in standard photometric bands presented in a previous paper (Prieto et al. 1991, Paper I). These and their combinations in the form of colour index images, offer high quality information about the structure of the galaxies, allowing us to pick out the major concentrations of dust and star formation, notably in the intermediate zone between bulge and disc. The detection of these structures allows us to interpret the radial luminosity profiles of the galaxies, in particular where these show departures from the simple sum of an R^1/4^ law bulge component and an exponential disc component. The radial colour index profiles are shown to be especially useful in revealing the presence of a true bulge and hence in effecting a reliable bulge-disc decomposition. We infer that in all the galaxies examined here, the causes of observed departures from simple two-component bulge + disc models for radial profiles are to be found in the intermediate zones of the galaxies, and are the enhanced young stellar populations and the associated dust concentrations encountered in these zones. The combined effects on the radial profiles give rise to phenomena such as false bulges and "Freeman type II" profiles, without in any given case implying the presence of a separate massive stellar component of intermediate morphology or age. Finally we propose an empirical classification scheme for radial profiles of spirals, based on the criteria developed in the body of the paper. Key words: galaxies: photometry - galaxies: spiral - galaxies: stellar content
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