Imaging spectrophotometry of ionized gas in NGC 1068. III, Anisotropic excitation of the large-scale disk by scattering of nuclear continuum
Imaging spectrophotometry of ionized gas in NGC 1068. III, Anisotropic excitation of the large-scale disk by scattering of nuclear continuum
复制标题
NGC 1068 中电离气体的成像分光光度测量。 III，通过核连续谱散射对大尺度圆盘进行各向异性激发
DOI：
10.1086/170219
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
G. Cecil
中科院分区：
文献类型：
--
作者：
J. Sokolowski;J. Bland;G. Cecil
利用各向异性核发射研究了NGC1068中太阳丰度弥散电离介质（DIM）的光电离。它表明，发射特性可以理解的光的星系中，其内在的1型塞弗特核，隐藏在一个模糊的介质，是可见的，只有通过散射，偏振光的发展图片。气体激发是各向异性的，沿着喷流轴的高激发气体被直接的核连续谱光电离，而远离喷流轴的低激发气体只看到散射到其中的间接的核发射。详细考虑了一个低光学深度的近核汤姆逊散射模型，结果表明，即使有中等的尘埃消光，这种机制也足以激发DIM。参考文献56。
Photoionization of the solar abundance diffuse ionized media (DIM) in NGC 1068 by anisotropic nuclear emission is studied. It is shown that the emission characteristics can be understood in the light of the developing picture of the galaxy in which its intrinsic type 1 Seyfert nucleus, concealed by an obscuring medium, is visible only through scattered, polarized light. The gas excitation is anisotropic, the high-excitation gas along the jet axis being photoionized by direct nuclear continuum, while the lower excitation gas away from the axis sees only indirect nuclear emission scattered into it. A model of low optical depth, near-nuclear Thomson scattering is considered in detail, and it is shown that, even with moderate dust extinction, this mechanism is sufficient to energize the DIM. 56 refs.