Chandra X-ray Observatory Stack acisfJ2043269m503537_001

CSC uses combined (i.e. overlapping) Chandra observations for detecting X-ray sources. This allows the catalog to include significantly fainter sources than CSC 1.1. The set of overlapping observations that have been combined in this way is known as a "stack".钱德拉源编目（Chandra Source Catalog，CSC）采用合并（即重叠）的钱德拉观测数据开展X射线源探测工作。此举使得该编目可收录显著暗弱于CSC 1.1版本的天体源。经此种方式合并得到的重叠观测数据集，被称为“堆叠（stack）”。