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外文期刊>The Astrophysical journal
>A DETAILED MORPHO-KINEMATIC MODEL OF THE ESKIMO, NGC?2392: A UNIFYING VIEW WITH THE CAT'S EYE AND SATURN PLANETARY NEBULAE
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A DETAILED MORPHO-KINEMATIC MODEL OF THE ESKIMO, NGC?2392: A UNIFYING VIEW WITH THE CAT'S EYE AND SATURN PLANETARY NEBULAE
The three-dimensional and kinematic structure of the Eskimo nebula, NGC?2392, has been notoriously difficult to interpret in detail given its complex morphology, multiple kinematic components and its nearly pole-on orientation along the line of sight. We present a comprehensive, spatially resolved, high-resolution, long-slit spectroscopic mapping of the Eskimo planetary nebula. The data consist of 21 spatially resolved, long-slit echelle spectra tightly spaced over the Eskimo and along its bipolar jets. This data set allows us to construct a velocity-resolved [N II] channel map of the nebula with a resolution of 10 km s–1 that disentangles its different kinematic components. The spectroscopic information is combined with Hubble Space Telescope images to construct a detailed three-dimensional morpho-kinematic model of the Eskimo using the code SHAPE. With this model we demonstrate that the Eskimo is a close analog to the Saturn and the Cat's Eye nebulae, but rotated 90° to the line of sight. Furthermore, we show that the main characteristics of our model apply to the general properties of the group of elliptical planetary nebulae with ansae or FLIERS, once the orientation is considered. We conclude that this kind of nebula belongs to a class with a complex common evolutionary sequence of events.
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机译：众所周知，爱斯基摩星云的三维运动学结构NGC？2392很难详细解释，这是因为它的形态复杂，运动学成分繁多并且沿视线几乎呈杆上指向。我们提出了爱斯基摩人行星状星云的全面，空间分辨，高分辨率，长缝光谱映射。数据由21个空间分辨的长缝echelle光谱组成，该光谱在爱斯基摩人及其双极射流之间紧密分布。该数据集使我们能够构建星云的速度分辨[N II]通道图，其分辨率为10 km s-1，可以解开其不同的运动学分量。光谱信息与哈勃太空望远镜的图像相结合，使用代码SHAPE构造了爱斯基摩人的详细三维形态运动学模型。通过此模型，我们可以证明爱斯基摩人与土星和猫眼星云非常相似，但它们旋转了90°到了视线。此外，我们表明，一旦考虑了方向，该模型的主要特征将应用于具有ansae或FLIERS的椭圆形行星状星云组的一般属性。我们得出的结论是，这种星云属于具有复杂的共同事件演化序列的类。
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