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An image of the dust sublimation region in the nucleus of NGC 1068

An image of the dust sublimation region in the nucleus of NGC 1068
An image of the dust sublimation region in the nucleus of NGC 1068
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.
Galaxies: Seyfert, Galaxies: active, Galaxies: nuclei, Techniques: interferometric
0004-6361
Pfuhl, O.
54ec7827-0bd8-4eb2-9e64-d678581b76e1
Davies, R.
ec8bb88a-22b9-42b9-9f30-4d1682858489
Dexter, J.
9911774a-4f54-4242-b89a-4b672cddf5f3
Hoenig, Sebastian
be0bb8bc-bdac-4442-8edc-f735834f3917
GRAVITY Collaboration
Pfuhl, O.
54ec7827-0bd8-4eb2-9e64-d678581b76e1
Davies, R.
ec8bb88a-22b9-42b9-9f30-4d1682858489
Dexter, J.
9911774a-4f54-4242-b89a-4b672cddf5f3
Hoenig, Sebastian
be0bb8bc-bdac-4442-8edc-f735834f3917

Pfuhl, O., Davies, R. and Dexter, J. , GRAVITY Collaboration (2020) An image of the dust sublimation region in the nucleus of NGC 1068. Astronomy & Astrophysics, 634, [A1]. (doi:10.1051/0004-6361/201936255).

Record type: Article

Abstract

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.

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Accepted/In Press date: 1 December 2019
Published date: 20 February 2020
Keywords: Galaxies: Seyfert, Galaxies: active, Galaxies: nuclei, Techniques: interferometric

Identifiers

Local EPrints ID: 442605
URI: http://eprints.soton.ac.uk/id/eprint/442605
ISSN: 0004-6361
PURE UUID: e705ecb3-0731-410f-b313-cfa11d50d431

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Date deposited: 21 Jul 2020 16:30
Last modified: 25 Nov 2021 21:33

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Contributors

Author: O. Pfuhl
Author: R. Davies
Author: J. Dexter
Corporate Author: GRAVITY Collaboration

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