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As part of the ESO-VLT Multi-Instrument Kinematic Survey (MIKiS) of Galacticglobular clusters, we present a detailed investigation of the internalkinematics of NGC 5986. The analysis is based on about 300 individual radialvelocities of stars located at various distances from the cluster center, up to300 arcseconds (about 4 half-mass radii). Our analysis reveals the presence ofa solid-body rotation extending from the cluster center to the outermostregions probed by the data, and a velocity dispersion profile initiallydeclining with the distance from the cluster's center, but flattening andstaying constant at ~5 km/s for distances larger than about one half-massradius. This is the first globular cluster for which evidence of the jointpresence of solid-body rotation and flattening in the outer velocity dispersionprofile is found. The combination of these two kinematical features provides aunique opportunity to shed light on fundamental aspects of globular clusterdynamics and probe the extent to which internal relaxation, star escape,angular momentum transport and loss, and the interaction with the Galaxy tidalfield can affect a cluster's dynamical evolution and determine its currentkinematical properties. We present the results of a series of N-bodysimulations illustrating the possible dynamical paths leading to kinematicfeatures like those observed in this cluster and the fundamental dynamicalprocesses that underpin them.

astrophysical journal/the astrophysical journal

The ESO Multi-Instrument Kinematic Survey (MIKiS) of Galactic Globular  Clusters: solid body rotation and anomalous velocity dispersion profile in  NGC 5986