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| HAL: hal-00708693, version 1 |
| arXiv: 1204.6122 |
| ADS Bibliographic id: 2012A&A...541L...9W |
| DOI: 10.1051/0004-6361/201219213 |
| Detailed view |  Export this paper |
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| Astronomy & Astrophysics 541 (2012) L9 |
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| VLTI/AMBER observations of the Seyfert nucleus of NGC 3783 |
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| G. Weigelt 1K.-H. Hofmann 2 |
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| (2012-05) |
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| 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. Based on observations made with ESO telescopes at Paranal Observatory under programme IDs 083.B-0212(A) and 087.B-0578(A). |
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| 1: | Max Planck Institute Für RadioAstronomie (MPIFR) |
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Max-Planck-Institut |
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| 2: | Max-Planck Institut für Radioastronomie (MPIFR) |
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Max-Planck-Institut |
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| 3: | Max-Planck-Institut für Radioastronomie (MPIFR) |
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Max-Planck-Institut |
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| 4: | UCSB Department of Physics (UCSB) |
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UCSB |
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| 5: | Osservatorio Astrofisico di Arcetri (OAA) |
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Istituto Nazionale di Astrofisica |
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| 6: | Joseph Louis LAGRANGE (LAGRANGE) |
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Observatoire de la Côte d'Azur – Université Nice Sophia Antipolis [UNS] – CNRS : UMR7293 |
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| 7: | Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) |
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CNRS : UMR5274 – INSU – Université Joseph Fourier - Grenoble I – OSUG |
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| Subject | : | Sciences of the Universe/Astrophysics/Galactic Astrophysics Physics/Astrophysics/Galactic Astrophysics |
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| galaxies: active – galaxies: Seyfert – techniques: interferometric – galaxies: individual: NGC 3783 |
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| Fulltext link: |
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| http://fr.arXiv.org/abs/1204.6122 |
| hal-00708693, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00708693 | |
| oai:hal.archives-ouvertes.fr:hal-00708693 | |
| From: Didier Fraix-Burnet | |
| Submitted on: Friday, 15 June 2012 15:11:49 | |
| Updated on: Monday, 18 June 2012 17:47:46 | |
