Chandra X-ray Observatory Stack acisfJ0547027m513308_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）利用整合后的（即重叠的）钱德拉（Chandra）观测数据开展X射线源探测。此举可使该目录收录的X射线源暗弱程度显著低于CSC 1.1版本。通过此种方式组合的重叠观测数据集被称为‘叠加观测集（stack）’。