J/A+A/711/A169ivo://CDS.VizieR/J/A+A/711/A169CDSMackensen N.Heidt J.Pozo Nunez F.2026-08-10T08:12:20Z2026-07-10T08:35:34ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frseyfert-galaxiesactive-galactic-nucleiinfrared-astronomyThe high-resolution imaging of active galactic nuclei on sub-kiloparsec scales offers an important avenue for investigating their fueling. Observations in the near-infrared are especially valuable as they minimize the absorption by dust. However, the inferred nuclear morphology may depend on the method used to analyze the images. The aim of this study is to assess whether ground-based adaptive-optics observations of the cores of Seyfert 2 galaxies in the Ks-band provide advantages over HST observations at shorter wavelengths (V- and H-band). We also investigate whether a dedicated two-dimensional analysis is preferable to a one-dimensional approach. A sample of 18 Seyfert 2 galaxies was observed with the adaptive optics system in the Ks-band at the Large Binocular Telescope and compared to archival HST V- or H-band images. The analysis included two-dimensional modeling via GALFIT and the use of the unsharp masking technique. The results obtained in different filters are mutually consistent, indicating no clear advantage of using a redder filter. Using GALFIT and unsharp-masking in concert is preferable, as the two methods provide complementary strengths. We identify nuclear stellar rings in 8 of the 18 galaxies in our sample (44+-12%. This fraction is significantly higher than reported in previous studies, and about a factor of two higher than found in the most complete atlas of nuclear rings. The radii, size distribution, and inferred masses of the detected nuclear rings are similar to those observed in non-active galaxies. Low-luminosity active nuclei seem to have little, if any, impact on the formation and evolution of nuclear rings. The high incidence of nuclear stellar rings was unexpected and warrants further investigation. It can be tested using the large number of suitable archival HST images available. If confirmed, it would imply that nuclear stellar rings are considerably more common than previously recognized.2026A&A...711A.169Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/711/A169CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/711/A169https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/711/A169http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/711/A169https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/711/A169https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/711/A169http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/711/A169GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/711/A169/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/711/A169/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/711/A169/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/711/A169/list?GETtext/xml+votable180.050000true206.8250834.147660.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/711/A1696/4447 5183 5202 7957 10166 10364 10366 10454 10475 10560 10925 11443 13381 13489 19619 25790 28123 28221https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/711/A169?format=asciiInfrareddefaultJ/A+A/711/A169/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar