Revisiting the location and environment of the central engine in NGC 1068
Revisiting the location and environment of the central engine in NGC 1068
复制标题
重新审视 NGC 1068 中央引擎的位置和环境
DOI：
10.1051/0004-6361:20031492
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发表时间：
2003
影响因子：
6.5
通讯作者：
M. Villar
中科院分区：
文献类型：
--
作者：
E. Galliano;D. Alloin;G. Granato;M. Villar
We revisit in this paper the location of the various components observed in the AGN of NGC 1068. Discrepancies between previously published studies are explained, and a new measurement for the absolute location of the K-band emission peak is provided. It is found to be consistent with the position of the central engine as derived by Gallimore et al. (1997), Capetti et al. (1997) and Kishimoto (1999). A series of map overlays is then presented and discussed. Model predictions of dusty tori show that the nuclear unresolved NIR-MIR emission is compatible with a broad range of models: the nuclear SED alone does not strongly constrain the torus geometry, while placing reasonable constraints on its size and thickness. The extended MIR emission observed within the ionizing cone is shown to be well explained by the presence of optically thick dust clouds exposed to the central engine radiation and having a small covering factor. Conversely, a distribution of diffuse dust particles within the ionizing cone is discarded. A simple model for the H2 and CO emission observed perpendicularly to the axis of the ionizing cone is proposed. We show that a slight tilt between the molecular disc and the Compton thick central absorber naturally reproduces the observed distribution of H2 of CO emission.
