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Hitomi Constraints on the 3.5 keV Line in the Perseus Galaxy Cluster

Mukai, K.; Yamaguchi, H.; Koyama, K. +215 more

High-resolution X-ray spectroscopy with Hitomi was expected to resolve the origin of the faint unidentified E≈ 3.5 {keV} emission line reported in several low-resolution studies of various massive systems, such as galaxies and clusters, including the Perseus cluster. We have analyzed the Hitomi first-light observation of the Perseus cluster. The e…