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

Gravity Collaboration; Pfuhl, O.; Davies, R.; Dexter, J.; Netzer, H.; Hönig, S.; Lutz, D.; Schartmann, M.; Sturm, E.; Amorim, A.; Brandner, W.; Clénet, Y.; de Zeeuw, P. T.; Eckart, A.; Eisenhauer, F.; Förster Schreiber, N. M.; Gao, F.; Garcia, P. J. V.; Genzel, R.; Gillessen, S.; Gratadour, D.; Kishimoto, M.; Lacour, S.; Millour, F.; Ott, T.; Paumard, T.; Perraut, K.; Perrin, G.; Peterson, B. M.; Petrucci, P. O.; Prieto, M. A.; Rouan, D.; Shangguan, J.; Shimizu, T.; Sternberg, A.; Straub, O.; Straubmeier, C.; Tacconi, L. J.; Tristram, K. R. W.; Vermot, P.; Waisberg, I.; Widmann, F.; Woillez, J.
Bibliographical reference

Astronomy and Astrophysics

Advertised on:
2
2020
Number of authors
43
IAC number of authors
1
Citations
96
Refereed citations
87
Description
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.

The reconstructed image and interferometric beam are available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/634/A1
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