I. The data
Instituto de Astrofísica de Andalucía (CSIC), Apartado 3004, E-18080 Granada, Spain
2 Institut d'Astrophysique de Paris, CNRS, 98bis Bd. Arago, F-75014 Paris, France
3 DAEC, Observatoire de Paris, Université Paris VII, CNRS (UA 173), F-92195 Meudon Cedex, France
4 Departamento de Astronomía, Universidad de Chile, Casilla 36D, Santiago, Chile
5 Instituto de Matemáticas y Física Fundamental (CSIC), Madrid, Spain and Observatorio Astronómico Nacional, Madrid, Spain. Presently on sabbatical leave at Queen Mary & Westfield College, London, UK
6 Observatories of the Carnegie Institution of Washington, 813 Barbara Street, Pasadena, CA 91101, U.S.A.
Send offprint request to: I. Márquez
Accepted: 27 August 1999
We present infrared imaging data in the J and bands obtained for 18 active spiral galaxies, together with 11 non active galaxies taken as a control sample. All of them were chosen to satisfy well defined isolation criteria so that the observed properties are not related to gravitational interaction. For each object we give: the image in the band, the sharp-divided image (obtained by dividing the observed image by a filtered one), the difference image (obtained by subtracting a model to the observed one), the color image, the ellipticity and position angle profiles, the surface brightness profiles in J and , their fits by bulge+disk models and the color gradient. We have found that four (one) active (control) galaxies previously classified as non-barred turn out to have bars when observed in the near-infrared. One of these four galaxies (UGC 1395) also harbours a secondary bar. 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) is present. The work presented here is part of a large program (DEGAS) aimed at finding out whether there are differences between active and non active galaxies in the properties of their central regions that could be connected with the onset of nuclear activity.
Key words: galaxies: active / galaxies: fundamental parameters / galaxies: photometry / infrared: galaxies
Based on data obtained at: the European Southern Observatory, La Silla, Chile, the Télescope Bernard Lyot, Calar Alto Observatory, Las Campanas Observatory. Also based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Institute.
© European Southern Observatory (ESO), 1999