Chandra X-ray Observatory Stack acisfJ0859461p392301_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".钱德拉源目录（Chandra Source Catalog，CSC）采用合并（即重叠）的钱德拉观测数据来检测X射线源。相较于CSC 1.1版本，该目录可收录显著更暗弱的X射线源。以该方式合并的重叠观测集合被称为“堆叠（stack）”。