Chandra X-ray Observatory Stack acisfJ1539136p395434_002

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，简称CSC）采用经合并（即重叠）的钱德拉（Chandra）观测数据开展X射线源探测。这使得该星表能够收录比CSC 1.1版本暗得多的X射线源。以该方式合并的重叠观测数据集被称为“堆叠集（stack）”。