Two-colour CCD imaging of 15 Seyfert galaxies. Observations

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Abstract
We present the results of V (Johnson) and I/R (Cousins) CCD imaging of 15 Seyfert galaxies. Grey–scale and contour maps are provided as well as the results of elliptical fits to isophotes. The position angles and the axial ratios of the bars and the outer isophotes are obtained for each galaxy. We have found one clear and one possible unidentified bar, four inner and two outer rings in the galaxies not previously classified as barred or having these rings. The presence of four bars, and one outer ring has been confirmed for the galaxies with uncertain classification. Three galaxies previously classified as having inner rings did not reveal these. Four multiple-barred galaxies have been found. Two of them clearly show a secondary bar within a primary bar and another two have been classified as possible double-barred galaxies. The bar orientations have been compared with the [OIII] and radio major axes for five galaxies with known [OIII] and radio maps. It has been determined that the bar is aligned with the [OIII] and radio emission in three objects. In the inner regions of Mkn 3, Mkn 573 and Mkn 1073 colour maps have revealed jet-like structures which are similar (for Mkn 3 and Mkn 573) to the [OIII] images on the same scale and have position angles close to those of the radio sources.