Chandra X-ray Observatory Stack acisfJ1819107m133237_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，以下简称CSC）采用组合（即重叠）的钱德拉观测数据探测X射线源。这使得该目录能够收录比CSC 1.1版本暗得多的X射线源。通过此种方式合并的重叠观测数据集被称为“堆叠（stack）”。