NGC 6822中的恒星复合体和恒星星族--与麦哲伦云的比较
Star complexes and stellar populations in NGC 6822 - Comparison with the Magellanic Clouds
摘要：
对NGC 6822的恒星复合体（大尺度恒星形成区）进行了追踪和填图，并将其大小分布与麦哲伦云（MC）中的恒星复合体大小分布进行了比较。此外，还比较了不同年龄恒星星族的空间分布。NGC 6822的恒星复合体是根据星系中年轻恒星的数量，使用密度的统计截止极限，通过等值线确定的。为了映射它们并确定它们的几何特性，将椭圆拟合到满足这一最小限制的每个不同区域。使用Kolmogorov-Smirnov统计检验来研究其粒度分布的可能模式。等值线图也被用来研究NGC 6822的恒星星族。NGC 6822的恒星复合体被探测到，并产生了它们的位置和大小的列表。在NGC 6822和MC中发现了恒星形成的等级，包括空间分布，时间演化和优选尺寸。不同年龄的恒星星族的空间分布表明，在NGC 6822中存在着相互作用的痕迹，其年龄在3.5亿+/-5千万年之前。
英文摘要：
The star complexes (large scale star forming regions) of NGC 6822 were traced and mapped and their size distribution was compared with the size distribution of star complexes in the Magellanic Clouds (MCs). Furthermore, the spatial distributions of different age stellar populations were compared with each other. The star complexes of NGC 6822 were determined by using the isopleths, based on star counts, of the young stars of the galaxy, using a statistical cutoff limit in density. In order to map them and determine their geometrical properties, an ellipse was fitted to every distinct region satisfying this minimum limit. The Kolmogorov-Smirnov statistical test was used to study possible patterns in their size distribution. Isopleths were also used to study the stellar populations of NGC 6822. The star complexes of NGC 6822 were detected and a list of their positions and sizes was produced. Indications of hierarchical star formation, in terms of spatial distribution, time evolution and preferable sizes were found in NGC 6822 and the MCs. The spatial distribution of the various age stellar populations has indicated traces of an interaction in NGC 6822, dated before 350 +/- 50 Myr.
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