Gerhard, Ortwin; Arnaboldi, Magda; Freeman, Kenneth; Okamura, Sadanori; Kashikawa, Nobunari; Yasuda, Naoki
Aims. The Coma cluster is the richest and most compact of the nearby clusters, yet there is growing evidence that its formation is still on-going. A sensitive probe of this evolution is the dynamics of intracluster stars, which are unbound from galaxies while the cluster forms, according to cosmological simulations. Methods. With a new multi-slit imaging spectroscopy technique pioneered at the 8.2 m Subaru telescope and FOCAS, we have detected and measured the line-of-sight velocities of 37...[Show more]
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