Chandra X-ray Observatory Stack acisfJ1552071p200524_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）采用联合（即重叠）的钱德拉（Chandra）观测数据开展X射线源（X-ray sources）探测工作。该方案可使本星表收录远暗于CSC 1.1的天体源。以该方式联合的重叠观测数据集被称为‘堆叠（stack）’。