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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693416.0, MPI für Astronomie / Publikationen_mpia
Kinematics of outer halo globular clusters in M31
Authors:Veljanoski, J.; Ferguson, A. M. N.; Mackey, A. D.; Huxor, A. P.; Irwin, M. J.; Côté, P.; Tanvir, N. R.; Bernard, E. J.; Chapman, S. C.; Ibata, R. A.; Fardal, M.; Lewis, G. F.; Martin, N. F.; McConnachie, A.; Peñarrubia, J.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:The Astrophysical Journal Letters
Start Page:id. L33 (5 pp)
Audience:Not Specified
Abstract / Description:We present the first kinematic analysis of the far outer halo globular cluster (GC) population in the Local Group galaxy M31. Our sample contains 53 objects with projected radii of ~20-130 kpc, 44 of which have no previous spectroscopic information. GCs with projected radii >~ 30 kpc are found to exhibit net rotation around the minor axis of M31, in the same sense as the inner GCs, albeit with a smaller amplitude of 79 ± 19 km s-1. The rotation-corrected velocity dispersion of the full halo GC sample is 106 ± 12 km s-1, which we observe to decrease with increasing projected radius. We find compelling evidence for kinematic coherence among GCs that project on top of halo substructure, including a clear signature of infall for GCs lying along the northwest stream. Using the tracer mass estimator, we estimate the dynamical mass of M31 within 200 kpc to be M M31 = (1.2-1.5) ± 0.2 × 1012 M . This value is highly dependent on the chosen model and assumptions within.
Free Keywords:galaxies: halos; galaxies: individual: M31; galaxies: kinematics and dynamics; globular clusters: general; Local Group
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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