Chandra X-ray Observatory Stack acisfJ0838438m530510_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（钱德拉源编目，Chandra Source Catalog）采用经合并（即观测间存在重叠）的钱德拉观测数据开展X射线源探测。此举可使该编目收录比CSC 1.1显著更暗弱的天体源。通过此种方式合并的重叠观测数据集，被称为“堆叠（stack）”。