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arXiv 1302.3520astro-ph.GAastro-ph.CO
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边缘旋涡星系ESO 379- G006的二维运动学

2D kinematics of the edge-on spiral galaxy ESO 379-G006

M. Rosado, R. F. Gabbasov, P. Repetto, I. Fuentes-Carrera, P. Amram, M. Martos, O. Hernandez

摘要:

我们提出了一个运动学研究的近边缘上的星系ESO 379-G 006,显示存在的面外电离气体。与法布里-珀罗光谱在H-α,我们研究的运动学ESO 379-G 006使用速度图和位置-速度图平行的长轴和短轴的星系。我们建立了盘的旋转曲线,讨论了由于近侧观察该星系而引起的投影效应的作用,并讨论了ESO 379-G 006盘径向速度场中等速线的扭曲以及在某些位置发现的运动学不对称性。平行于星系短轴的速度图表明,在圆盘中存在着偏离圆周运动的现象,这种现象可以用下列公式来模拟和解释:可能由杆或螺旋臂产生的径向流入。我们成功地在这个星系中探测到了面外弥漫电离气体。同时,通过对位置-速度图的分析,我们发现了面外气体相对于中面旋转的旋转速度滞后的证据。

英文摘要:

We present a kinematical study of the nearly edge-on galaxy ESO 379-G006 that shows the existence of extraplanar ionized gas. With Fabry-Perot spectroscopy at H-alpha, we study the kinematics of ESO 379-G006 using velocity maps and position-velocity diagrams parallel to the major and to the minor axis of the galaxy. We build the rotation curve of the disk and discuss the role of projection effects due to the fact of viewing this galaxy nearly edge-on. The twisting of the isovelocities in the radial velocity field of the disk of ESO 379-G006 as well as the kinematic asymmetries found in some position-velocity diagrams parallel to the minor axis of the galaxy suggest the existence of deviations to circular motions in the disk that can be modeled and explained with the inclusion of a radial inflow probably generated by a bar or by spiral arms. We succeeded in detecting extraplanar Diffuse Ionized Gas in this galaxy. At the same time, from the analysis of position-velocity diagrams, we found some evidence that the extraplanar gas could lag in rotation velocity with respect to the midplane rotation.

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