Global Kinematics of the Globular Cluster M15 | Zendy

G. A. Drukier | Zendy; S. D. Slavin | Zendy; H. N. Cohn | Zendy; P. M. Lugger | Zendy; Robert C. Berrington | Zendy; B. W. Murphy | Zendy; Patrick Seitzer | Zendy

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Global Kinematics of the Globular Cluster M15

Author(s) -

G. A. Drukier,

S. D. Slavin,

H. N. Cohn,

P. M. Lugger,

Robert C. Berrington,

B. W. Murphy,

Patrick Seitzer

Publication year - 1998

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/300231

Subject(s) - globular cluster , physics , velocity dispersion , astrophysics , rotation (mathematics) , radius , stars , kinematics , cluster (spacecraft) , position angle , magnitude (astronomy) , dispersion (optics) , position (finance) , astronomy , galaxy , geometry , optics , classical mechanics , computer science , programming language , mathematics , computer security , finance , economics

We present velocities for 230 stars in the outer parts of the globularcluster M15 measured with the Hydra multi-object spectrograph on the WIYNtelescope. A new Bayesian technique is used for analyzing the data. The meanvelocity of the cluster is -106.9+/- 0.3 km/s. Rotation with an amplitude of1.5+/- 0.4 km/s and a position angle of 125+/-19 degrees is observed and themodel including rotation is marginally favored over one without rotation. Thevelocity dispersion decreases from the center out to about 7' and then appearsto increase slightly. This behavior is strikingly different from the continueddecline of velocity dispersion with increasing radius that is expected in anisolated cluster. We interpret this as an indication of heating of the outerpart of M15 by the Galactic tidal field.Comment: 32 pages, LaTeX, includes 13 eps figures, 5 tables are in external tex files, to appear in Feb 1998 A

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