7 Summary

We have observed a sample of 29 isolated spiral galaxies: 18 host an AGN (Seyfert 1 or Seyfert 2) and 11 are non-active galaxies. We present here the infrared data in the J and K' bands, as well as the image analysis. This includes sharp-divided images obtained by dividing the observed images by their filtered counterparts, difference images, obtained by fitting ellipses to the isophotes and subtracting such models to the observed images, and colour J/K'images. A bulge+disk model was fit to the image profiles, and the corresponding fit parameters are given.

Four (one) out of five (one) of the optically classified non-barred active (control) galaxies harbour a bar. Three of them had already been described as barred galaxies, as derived either from NIR (UGC 1395, which also has a secondary bar, and NGC 6890) or optical I (NGC 3281) analyses. The other two (NGC 2639 and NGC 4162) are classified as barred for the first time. For 15 (9 active, 6 control) out of 24 (14 active, 10 control) of the optically classified barred galaxies (SB or SX) we find that a secondary bar (or a disk, a lense or an elongated ring; see Table 5 for those cases for which the reported central elongation remains uncertain) is present.

A discussion on the physical properties of these galaxies, together with the comparison of the properties of active versus non-active galaxies derived from these data will be presented in a forthcoming paper (Márquez et al., in preparation).

Acknowledgements

I. Márquez acknowledges financial support from the Spanish Ministerio de Educación y Ciencia (EX94-8826734). This work is financed by DGICyT grants PB93-0139 and PR95-329. We acknowledge financial support from INSU-CNRS for several observing trips. Financial support to develop the present investigation has been obtained by the French-Spanish HF1996-0104 and HF1998-0052 and the Chilean-Spanish bilateral agreement CSIC-CONICYT 99CL0018.

We thank Ron Probst, who made available the SQIID package for the reduction of infrared images within IRAF available to us. This research has made use of the NASA/IPAC extragalactic database (NED), which is operated by the Jet Propulsion Laboratory under contract with the National Aeronautics and Space Administration.