Volume 634, February 2020
|Number of page(s)||12|
|Published online||28 January 2020|
An image of the dust sublimation region in the nucleus of NGC 1068⋆
Max Planck Institute for Extraterrestrial Physics(MPE), Giessenbachstr.1, 85748 Garching, Germany
2 LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, France
3 I. Institute of Physics, University of Cologne, Zülpicher Straße 77, 50937 Cologne, Germany
4 Departments of Physics and Astronomy, Le Conte Hall, University of California, Berkeley, CA 94720, USA
5 Department of Physics and Astronomy, University of Southampton, Southampton, UK
6 Department of Physics, Kyoto Sangyo University, Kita-ku, Japan
7 Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, Nice, France
8 School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
9 Department of Astronomy, The Ohio State University, Columbus, OH, USA
10 Center for Cosmology and AstroParticle Physics, The Ohio State University, Columbus, OH, USA
11 Space Telescope Science Institute, Baltimore, MD, USA
12 Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
13 School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
14 Center for Computational Astrophysics, Flatiron Institute, 162 5th Ave., New York, NY 10010, USA
15 European Southern Observatory, Casilla 19001, Santiago 19, Chile
16 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
17 Sterrewacht Leiden, Leiden University, Postbus 9513, 2300, RA Leiden, The Netherlands
18 Max Planck Institute for Radio Astronomy, Bonn, Germany
19 Universidade de Lisboa – Faculdade de Ciências, Campo Grande, 1749-016 Lisboa, Portugal
20 Faculdade de Engenharia, Universidade do Porto, rua Dr. Roberto Frias, 4200-465 Porto, Portugal
21 CENTRA – Centro de Astrofísica e Gravitação, IST, Universidade de Lisboa, 1049-001 Lisboa, Portugal
22 Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
23 Instituto de Astrofísica de Canarias (IAC), 38200 La Laguna, Tenerife, Spain
Accepted: 1 December 2019
We present near-infrared interferometric data on the Seyfert 2 galaxy NGC 1068, obtained with the GRAVITY instrument on the European Southern Observatory Very Large Telescope Interferometer. The extensive baseline coverage from 5 to 60 Mλ allowed us to reconstruct a continuum image of the nucleus with an unrivaled 0.2 pc resolution in the K-band. We find a thin ring-like structure of emission with a radius r = 0.24 ± 0.03 pc, inclination i = 70 ± 5°, position angle PA = −50 ± 4°, and h/r < 0.14, which we associate with the dust sublimation region. The observed morphology is inconsistent with the expected signatures of a geometrically and optically thick torus. Instead, the infrared emission shows a striking resemblance to the 22 GHz maser disc, which suggests they share a common region of origin. The near-infrared spectral energy distribution indicates a bolometric luminosity of (0.4–4.7) × 1045 erg s−1, behind a large AK ≈ 5.5 (AV ≈ 90) screen of extinction that also appears to contribute significantly to obscuring the broad line region.
Key words: galaxies: active / galaxies: nuclei / galaxies: Seyfert / techniques: interferometric
The reconstructed image and interferometric beam are available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (126.96.36.199) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/634/A1
© GRAVITY Collaboration et al. 2020
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Open Access funding provided by Max Planck Society.
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