Chandra X-ray Observatory Stack acisfJ1702057m295718_002

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）采用经合并处理的（即基于重叠观测的）钱德拉（Chandra）观测数据开展X射线源探测。该方法可使本目录收录的X射线源暗度显著低于CSC 1.1版本。通过此种方式合并得到的重叠观测数据集，被称为‘堆叠（stack）’。