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Parallel analysis of the large-scale morphology and local environment ofmatched active and control galaxy samples plays an important role in studies ofthe fueling of active galactic nuclei. We carry out a detailed morphologicalcharacterization of a sample of 35 Seyfert galaxies and a matched sample ofinactive galaxies in order to compare the evidence of non-axisymmetricperturbation of the potential and, in the second part of this paper, to be ableto perform a multicomponent photometric decomposition of the Seyfert galaxies.We constructed contour maps, BVRcIc profiles of the surface brightness,ellipticity, and position angle, as well as colour index profiles. We furtherused colour index images, residual images, and structure maps, which helpedclarify the morphology of the galaxies. We studied the presence of closecompanions using literature data. By straightening out the morphological statusof some of the objects, we derived an improved morphological classification andbuilt a solid basis for a further multicomponent decomposition of the Seyfertsample. We report hitherto undetected (to our knowledge) structural componentsin some Seyfert galaxies - a bar (Ark 479), an oval/lens (Mrk 595), rings (Ark120, Mrk 376), a nuclear bar and ring (Mrk 352), and nuclear dust lanes (Mrk590). We compared the large-scale morphology and local environment of theSeyfert sample to those of the control one and found that (1) the two samplesshow similar incidences of bars, rings, asymmetries, and close companions; (2)the Seyfert bars are generally weaker than the bars of the control galaxies;(3) the bulk of the two samples shows morphological evidence ofnon-axisymmetric perturbations of the potential or close companions; (4) thefueling of Seyfert nuclei is not directly related to the large-scale morphologyand local environment of their host galaxies.

astronomy and astrophysics

Optical multiband surface photometry of a sample of Seyfert galaxies. I.  Large-scale morphology and local environment analysis of matched Seyfert and  inactive galaxy samples