X-ray clusters of galaxies as tracers of structure in the Universe
X-ray clusters of galaxies as tracers of structure in the Universe
复制标题
X射线星系团作为宇宙结构的示踪剂
作者：
S. Borgani;L. Guzzo
星系团是宇宙中物质网络的可见示踪物，标志着暗物质细丝连接在一起的高密度区域。当在X射线波长下观察时，这些星团就像宇宙灯塔一样闪耀，这是引力势威尔斯阱中捕获的热气的结果。X射线辐射直接与星系团的总质量有关，因此可以用来研究宇宙中相当大一部分的质量分布。最近研究中出现的图像与由冷暗物质主导的低密度宇宙的预测非常一致。
Clusters of galaxies are visible tracers of the network of matter in the Universe, marking the high-density regions where filaments of dark matter join together. When observed at X-ray wavelengths these clusters shine like cosmic lighthouses, as a consequence of the hot gas trapped within their gravitational potential wells. The X-ray emission is linked directly to the total mass of a cluster, and so can be used to investigate the mass distribution for a sizeable fraction of the Universe. The picture that has emerged from recent studies is remarkably consistent with the predictions for a low-density Universe dominated by cold dark matter.