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- Title
VLTI/AMBER observations of the Seyfert nucleus of NGC 3783.
- Authors
Weigelt, G.; Hofmann, K.-H.; Kishimoto, M.; Hönig, S.; Schertl, D.; Marconi, A.; Millour, F.; Petrov, R.; Fraix-Burnet, D.; Malbet, F.; Tristram, K.; Vannier, M.
- Abstract
Context. The putative tori surrounding the accretion disks of active galactic nuclei (AGNs) play a fundamental role in the unification scheme of AGNs. Infrared long-baseline interferometry allows us to study the inner dust distribution in AGNs with unprecedented spatial resolution over a wide infrared wavelength range. Aims. Near- and mid-infrared interferometry is used to investigate the milli-arcsecond-scale dust distribution in the type 1.5 Seyfert nucleus of NGC 3783. Methods. We observed NGC 3783 with the VLTI/AMBER instrument in the K-band and compared our observations with models. Results. From the K-band observations, we derive a ring-fit torus radius of 0.74 ±0.23 mas or 0.16 ±0.05 pc. We compare this size with infrared interferometric observations of other AGNs and UV/optical-infrared reverberation measurements. For the interpretation of our observations, we simultaneously model our near- and mid-infrared visibilities and the spectral energy distribution (SED) with a temperature/density-gradient model including an additional inner hot 1400 K ring component.
- Subjects
ACTIVE galactic nuclei; GALAXIES; INTERFEROMETRY; OPTICAL measurements; OPTICS -- Laboratory manuals
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2012, Vol 541, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201219213