观察鸟巢内部：合并星系NGC 1316（天炉座A）的隐藏结构
Looking inside the nest: the hidden structure of the merger galaxy NGC 1316 (Fornax A)
摘要：
我们使用近红外成像和恒星运动学分析了NGC 1316的环核结构。图像的二维分解表明存在类似于内部气体旋臂的结构，距离中心约5至15”（500至1500 pc）。我们还发现了半径小于200 pc的盘状恒星结构。分析以前发表的SINFONI积分场运动学数据表明，在同一空间尺度的运动学解耦的核心，进一步的证据表明，确实发现的核恒星结构是一个运动学冷恒星盘。我们认为，这两个新发现的结构组件是最近的一个伴星星系吸积的结果。
英文摘要：
We present an analysis of the circumnuclear structure of NGC 1316 using both near-infrared imaging and stellar kinematics. 2D decomposition of the images suggests the presence of a structure that resembles inner gaseous spiral arms, at about 5 to 15" from the center (500 to 1500 pc). We also find a disc-like stellar structure with radius less than 200 pc. Analysis of previously published SINFONI integral field kinematics data indicates a kinematically decoupled core in the same spatial scale, further evidence that indeed the nuclear stellar structure found is a kinematically cold stellar disc. We suggest that both newly-found structural components are the result of a recent accretion of a companion galaxy.
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