再论短轴尘埃带星系NGC1947的形成历史
Revisiting the formation History of the minor-axis dust lane galaxy NGC1947
摘要：
本文详细研究了一个奇特的早型星系NGC1947。本文的主要目的是通过比较观测到的性质和不同星系形成情景下的预测，来约束NGC1947的动力学状态和形成历史。为此，我们推导了NGC1947的光度学和运动学性质。由于存在一个扩展的尘埃带，它沿着光度短轴穿过星系中心，我们使用近红外图像（J和K波段）来获得恒星光分布的准确分析。光学图像（在V和R波段）被用来获得颜色配置文件和彩色地图，研究尘埃带的结构。观测到的运动学证实了存在两个分量与解耦角动量：气体和尘埃沿短轴旋转，而恒星的旋转速度沿长轴观察。在NGC1947中观察到的复杂结构支持了在该天体的演化过程中发生了某种相互作用的假设。我们分析了两种可能性：合并过程和吸积事件。我们讨论了所观察到的性质如何强烈地表明，去耦的气体和尘埃环已经从外部吸积。
英文摘要：
In this paper we present a detailed study of the peculiar early-type galaxy NGC1947. The main goal of this work is to constrain the dynamical status and the formation history of NGC1947 by comparing the observed properties with the predictions derived from different galaxy formation scenarios. To this aim, we derived the photometric and kinematical properties of NGC1947. Due to the presence of an extended dust-lane, which crosses the galaxy center along the photometric minor axis, we used near-infrared images (J and K bands) to derive an accurate analysis of the stellar light distribution. Optical images (in the V and R bands) are used to derive the color profiles and color maps to study the structure of the dust-lane. The observed kinematics confirm the presence of two components with decoupled angular momentum: gas and dust rotate along the minor axis, while the rotation velocities of the stars are observed along the major axis. The complex structure observed in NGC1947 support the hypothesis that some kind of interactions happened in the evolution of this object. We analyzed two alternatives: a merging process and an accretion event. We discussed how the observed properties strongly suggest that the decoupled ring of gas and dust have been accreted from outside.
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