标题： 星系对NGC 1512/1510中的气体动力学与恒星形成 显示英文标题

标题： Gas Dynamics and Star Formation in the Galaxy Pair NGC1512/1510

摘要： （摘录）我们展示了使用澳大利亚望远镜紧凑阵列获取的近邻星系对 NGC1512/1510 的中性氢（HI）谱线数据和 20 厘米射电连续谱数据。 这些数据由 GALEX 紫外线、SINGG 氢α发射线以及 Spitzer 中红外图像补充，使我们能够比较中性原子气体的分布与动力学与系统内恒星团簇的位置和年龄之间的关系。 对于棒旋双环星系 NGC1512，我们发现一个非常大的 HI 旋转盘，约为其光学直径的 4 倍，且具有两个显著的螺旋/潮汐臂。 其气体分布以及恒星形成区域的分布均受到邻近蓝矮星系 NGC1510 引力相互作用的影响。 距离中心约 80 千秒差距的两个最远的 HI 团块显示出恒星形成的迹象，可能为潮汐矮星系。 NGC1512 外盘的恒星形成通过深场光学和双色紫外图像揭示。 利用后者，我们确定了约 200 个恒星团簇的性质，并探索它们与更大范围内的 2XHI 盘中密集 HI 团块的相关性。 多波段分析表明，这个可能处于小合并早期阶段（约 4 亿年前开始）的 NGC1512/1510 星系系统，在从 1 到 100 千秒差距的尺度上连接了恒星和气体星系的特性。 显示英文摘要

摘要： (abridged) Here we present HI line and 20-cm radio continuum data of the nearby galaxy pair NGC1512/1510 as obtained with the Australia Telescope Compact Array. These are complemented by GALEX UV-, SINGG Halpha- and Spitzer mid-infrared images, allowing us to compare the distribution and kinematics of the neutral atomic gas with the locations and ages of the stellar clusters within the system. For the barred, double-ring galaxy NGC1512 we find a very large HI disk, about 4x its optical diameter, with two pronounced spiral/tidal arms. Both its gas distribution and the distribution of the star-forming regions are affected by gravitational interaction with the neighbouring blue compact dwarf galaxy NGC1510. The two most distant HI clumps, at radii of about 80 kpc, show signs of star formation and are likely tidal dwarf galaxies. Star formation in the outer disk of NGC1512 is revealed by deep optical- and two-color ultraviolet images. Using the latter we determine the properties of about 200 stellar clusters and explore their correlation with dense HI clumps in the even larger 2XHI disk. The multi-wavelength analysis of the NGC1512/1510 system, which is probably in the first stages of a minor merger having started about 400 Myr ago, links stellar and gaseous galaxy properties on scales from one to 100 kpc.