Chandra X-ray Observatory Stack hrcfJ1800169m285118_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".CSC（钱德拉源目录，Chandra Source Catalog）采用叠加（即重叠）的钱德拉观测数据来探测X射线源。这使得该星表能够收录比CSC 1.1暗得多的源。以该方式组合的重叠观测数据集被称为“堆叠（stack）”。