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
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DOI：
10.1051/0004-6361/201936255
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发表时间：
2019-12
影响因子：
6.5
通讯作者：
R. Abuter;M. Accardo;T. Adler;A. Amorim;N. Anugu;G. Ávila;M. Bauböck;M. Benisty;J. Berger
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作者：
R. Abuter;M. Accardo;T. Adler;A. Amorim;N. Anugu;G. Ávila;M. Bauböck;M. Benisty;J. Berger
我们目前的近红外干涉数据的塞弗特2星系NGC 1068，获得了欧洲南方天文台甚大望远镜干涉仪的重力仪器。从5到60 Mλ的广泛基线覆盖范围使我们能够在K波段以无与伦比的0.2 pc分辨率重建细胞核的连续图像。我们发现了一个薄的环状发射结构，半径r = 0.24 ± 0.03 pc，倾角i = 70 ± 5°，位置角PA = −50 ± 4°，h/r < 0.14，我们将其与尘埃升华区联系起来。观察到的形态与几何和光学厚环面的预期特征不一致。相反，红外辐射显示出与22 GHz脉泽盘惊人的相似之处，这表明它们共享一个共同的起源区域。近红外光谱的能量分布显示，它的辐射热光度为（0.4-4.7）× 1045 erg s−1，位于一个巨大的AK 5.5（AV 5.90）消光屏之后，这似乎也对宽线区域的模糊有很大的贡献。
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.