Chandra X-ray Observatory Stack acisfJ1857505p024002_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（钱德拉源星表，Chandra Source Catalog）采用组合（即重叠）的钱德拉观测数据来探测X射线源。这使得该星表可收录比CSC 1.1版本暗得多的天体源。以该方式组合的重叠观测数据集被称为“堆叠（stack）”。