Volume 541, May 2012
|Number of page(s)||4|
|Published online||16 May 2012|
VLTI/AMBER observations of the Seyfert nucleus of NGC 3783 ⋆
1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2 UCSB Department of Physics, Broida Hall 2015H, Santa Barbara CA, USA
3 Dipartimento di Fisica e Astronomia, Universitá di Firenze, Largo Enrico Fermi 2, 510125 Firenze, Italy
4 INAF – Osservatorio Astrofisico di Arcetri, Largo Fermi 5, 50125 Firenze, Italy
5 Laboratoire Lagrange, UMR 7293, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d’Azur, 06300 Nice, France
6 Université Joseph Fourier (UJF) – Grenoble 1/CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (IPAG) UMR 5274, 38041 Grenoble, France
Received: 13 March 2012
Accepted: 6 April 2012
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.
Key words: galaxies: active / galaxies: Seyfert / techniques: interferometric / galaxies: individual: NGC 3783
© ESO, 2012
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