Chandra X-ray Observatory Stack acisfJ0849108p044515_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）采用叠加（即重叠）的钱德拉（Chandra）观测数据开展X射线源探测。此举使得该目录可收录比CSC 1.1版本暗弱得多的X射线源。以该方式组合的重叠观测数据集被称为“堆叠（stack）”。