标题： 盘星系内部区域电离气体的位置-速度图 显示英文标题

标题： Position-velocity diagrams of ionized gas in the inner regions of disk galaxies

摘要： 我们利用沿23个近邻盘状星系主轴的长缝光谱，研究这些星系内区域电离气体组分的动力学性质。 对于每个星系，我们从其发射线推导出自旋速度图。 通过比较内区（r +/-1''）和外区（r +/-4''）测得的气体速度梯度、速度弥散度以及积分流量，我们讨论了此类自旋速度图中观察到的各种形状。 这种分析方法能够识别出可能寄主一个围绕中心质量聚集物旋转的核区星周圆盘星系，并为进一步使用哈勃空间望远镜观测提供目标。 显示英文摘要

摘要： We use long-slit spectroscopy along the major axis of a sample of 23 nearby disk galaxies to study the kinematic properties of the ionized-gas component in their inner regions. For each galaxy, we derive the position-velocity diagram of the ionized gas from its emission lines. We discuss the variety of shapes observed in such position-velocity diagrams by comparing the gas velocity gradient, velocity dispersion and integrated flux measured in the inner (r +/-1'') and outer regions (r +/-4''). This kind of analysis allows the identification of galaxies which are good candidates to host a circumnuclear Keplerian gaseous disk rotating around a central mass concentration, and to follow up with Hubble Space Telescope observations.