X-ray clusters of galaxies as tracers of structure in the Universe

摘要: Clusters of galaxies are visible tracers the network matter in Universe, marking high-density regions where filaments dark join together. When observed at X-ray wavelengths these clusters shine like cosmic lighthouses, as a consequence hot gas trapped within their gravitational potential wells. The emission is linked directly to total mass cluster, and so can be used investigate distribution for sizeable fraction Universe. picture that has emerged from recent studies remarkably consistent with predictions low-density Universe dominated by cold matter.