The Hitomi collaboration reports X-ray observations of the core of the Perseus cluster of galaxies — the brightest X-ray-emitting cluster in the sky. Such clusters typically consist of tens to thousands of galaxies bound together by gravity and are studied as models of both small-scale cosmology and large-scale astrophysical processes. The data reveal a remarkably quiescent atmosphere, where gas velocities are quite low, with a line-of-sight velocity dispersion of about 164 kilometres per second at a distance of 30–60 kiloparsecs from the central nucleus.
- Rare data from a lost satellite (News & Views p40, doi: 10.1038/535040a)
- The quiescent intracluster medium in the core of the Perseus cluster (Letter p117, doi: 10.1038/nature18627)
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