Chandra X-ray Observatory Stack acisfJ1239143p531420_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".CSC采用经组合（即重叠）的钱德拉X射线天文台（Chandra）观测数据探测X射线源。该方式可使本星表收录比CSC 1.1版本显著更暗的X射线源。通过上述方式组合得到的重叠观测数据集，被称为“叠加观测集（stack）”。