Chandra X-ray Observatory Stack acisfJ1338073m175101_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".钱德拉源编目（Chandra Source Catalog，简称CSC）采用合并（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。该编目能够收录比CSC 1.1版本所收录源暗弱得多的天体源。通过此种方式合并得到的重叠观测数据集，被称为"叠加组（stack）"。