NORAS galaxy cluster survey. I.

In the construction of an X-ray-selected sample of galaxy clusters for cosmological studies, we have assembled a sample of 495 X-ray sources found to show extended X-ray...在为宇宙学研究（cosmological studies）构建X射线选星系团样本（X-ray-selected sample of galaxy clusters）的过程中，我们共组建了一个包含495个被发现呈现延展X射线辐射……的X射线源（X-ray source）的样本。