Chandra X-ray Observatory Stack hrcfJ2207285p455109_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）采用经重叠组合的钱德拉观测数据来探测X射线源。这使得该目录能够收录比CSC 1.1暗得多的X射线源。以此方式组合的重叠观测数据集被称为"堆叠（stack）"。