Identification of Globular Cluster Stars in RAVE data II: Extended tidal debris around NGC 3201

B. Anguiano , G. de Silva , K. Freeman , G. da Costa , T. Zwitter , A. Quillen , D. Zucker , J. Navarro , A. Kunder , A. Siebert (1) , R. Wyse , E. Grebel , G. Kordopatis , B. Gibson , G. Seabroke , S. Sharma , J. Wojno , J. Bland-Hawthorn , Q. Parker , M. Steinmetz , C. Boeche , G. Gilmore , O. Bienaymé (1) , W. Reid , F. Watson

1 ObAS - Observatoire astronomique de Strasbourg

We report the identification of extended tidal debris potentially associated with the globular cluster NGC 3201, using the RAdial Velocity Experiment (RAVE) catalogue. We find the debris stars are located at a distance range of 1-7 kpc based on the forthcoming RAVE distance estimates. The derived space velocities and integrals of motion show interesting connections to NGC 3201, modulo uncertainties in the proper motions. Three stars, which are among the four most likely candidates for NGC 3201 tidal debris, are separated by 80° on the sky yet are well matched by the 12 Gyr, [Fe/H] = -1.5 isochrone appropriate for the cluster. This is the first time tidal debris around this cluster has been reported over such a large spatial extent, with implications for the cluster's origin and dynamical evolution.

Mots clés: globular clusters; individual; NGC 3201 -Galaxy; kinematics and dynamics

Domaines: Planète et Univers [physics]

B. Anguiano, G. de Silva, K. Freeman, G. da Costa, T. Zwitter, et al.. Identification of Globular Cluster Stars in RAVE data II: Extended tidal debris around NGC 3201. Monthly Notices of the Royal Astronomical Society, 2016, 457 (2), pp.2078-2085. ⟨10.1093/mnras/stw083⟩. ⟨hal-03159725⟩