反色散无缝光谱技术：NGC 1399晕中行星状星云的速度
Counter-dispersed slitless-spectroscopy technique: planetary nebula velocities in the halo of NGC 1399
摘要：
利用VLT上的FORS 1，利用反色散无狭缝光谱技术，我们探测和测量了距离我们最近的cD星系NGC 1399周围的187个行星状星云（PNE）的视速度。我们描述了发射线源的识别和分类方法以及计算其J2000坐标和速度的过程。PN检测的数量和速度测量的误差（37 km/s）表明，该技术与其他方法相当，例如Teodorescu等人（2005）所描述的方法。我们提出了PNe的空间分布和它们的速度的基本分析。PN二维速度场显示与其他研究一致的边缘旋转。我们还发现了一个低速子结构的晕和一个平坦的速度色散曲线相比，以前的观察，延伸到~400弧秒。低速子分量的检测强调了离散速度示踪剂用于检测未混合分量的重要性。新的速度-色散分布与修正后的NGC 1399中红色球状星团的速度色散非常一致，使用Schuberth等人（2009）的数据。这一剖面的外部与Kronawitter等人（2000年）的动力学模型一致，该模型对应的圆速度约为340 km/s，半径为7'处的重标度B波段质光比约为20。这些测量跟踪运动学的外晕和解开在天炉座星系团核心的异质人口。新的数据为NGC 1399外晕的修订动力学模型奠定了基础。
英文摘要：
Using a counter-dispersed slitless spectroscopy technique, we detect and measure the line-of-sight velocities of 187 planetary nebulae (PNe) around one of the nearest cD galaxies, NGC 1399, with FORS1 on the VLT. We describe the method for identifying and classifying the emission-line sources and the procedure for computing their J2000 coordinates and velocities. The number of PN detections and the errors in the velocity measurements (37 km/s indicate that this technique is comparable to other methods, such as that described by Teodorescu et al. (2005). We present the spatial distribution of the PNe and a basic analysis of their velocities. The PN two-dimensional velocity field shows marginal rotation consistent with other studies. We also find a low-velocity substructure in the halo and a flatter velocity-dispersion profile compared to previous observations that extends to ~400 arcsec. The detection of a low-velocity subcomponent underscores the importance of discrete velocity tracers for the detection of un-mixed components. The new velocity-dispersion profile is in good agreement with revised velocity dispersions for the red globular clusters in NGC 1399, using the data of Schuberth et al. (2009). The outer parts of this profile are consistent with one of the dynamical models of Kronawitter et al. (2000), which corresponds to a circular velocity of ~340 km/s and a rescaled B-band mass-to-light ratio of ~20 at 7' radius. These measurements trace the kinematics of the outer halo and disentangle the heterogenous populations in the Fornax Cluster core. The new data set the stage for a revised dynamical model of the outer halo of NGC 1399.
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