Kinematics of outer halo globular clusters in M31

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DOIResolve DOI: http://doi.org/10.1088/2041-8205/768/2/L33
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TypeArticle
Journal titleThe Astrophysical Journal Letters
ISSN2041-8205
Volume768
Issue2
Article numberL33
AbstractWe 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 × 10¹#&178; M . This value is highly dependent on the chosen model and assumptions within. © 2013. The American Astronomical Society. All rights reserved..
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Science Infrastructure
Peer reviewedYes
NPARC number21271782
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Record identifier7c32c9ab-c025-43ee-b92b-17e19279eee1
Record created2014-04-17
Record modified2016-05-09
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