Table · dataset · 2026
Ks-band images of 18 Seyfert galaxies
Listed in IVOA Registry (Virtual Observatory)
The high-resolution imaging of active galactic nuclei on sub-kiloparsec scales offers an important avenue for investigating their fueling.
Description
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.
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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.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/711/A169 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...711A.169M ui.adsabs.harvard.edu/abs/2026A%26A...711A.169M ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/711/a169 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Infrared
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/711/a169 | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:infrared | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].local:modality:image | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (65%) |
| concepts[modality].local:modality:imaging | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |