Identification of globular cluster stars in RAVE data II: extended tidal debris around NGC 3201

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

*Corresponding author for this work

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    Abstract

    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.

    Original languageEnglish
    Pages (from-to)2078-2085
    Number of pages8
    JournalMonthly Notices of the Royal Astronomical Society
    Volume457
    Issue number2
    DOIs
    Publication statusPublished - 1 Apr 2016

    Bibliographical note

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©:2016 the Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    Keywords

    • galaxy: kinematics and dynamics
    • globular clusters: individual: NGC 3201

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