| Download | - View final version: Kinematics of outer halo globular clusters in M31 (PDF, 535 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1088/2041-8205/768/2/L33 |
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| Author | Search for: Veljanoski, J.; Search for: Ferguson, A. M. N.; Search for: MacKey, A. D.; Search for: Huxor, A. P.; Search for: Irwin, M. J.; Search for: Côté, P.1; Search for: Tanvir, N. R.; Search for: Bernard, E. J.; Search for: Chapman, S. C.; Search for: Ibata, R. A.; Search for: Fardal, M.; Search for: Lewis, G. F.; Search for: Martin, N. F.; Search for: McConnachie, A.; Search for: Peñarrubia, J. |
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| Affiliation | - National Research Council of Canada. National Science Infrastructure
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| Format | Text, Article |
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| Abstract | 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. |
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| Publication date | 2013-04-26 |
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| Publisher | IOP |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21271782 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 7c32c9ab-c025-43ee-b92b-17e19279eee1 |
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| Record created | 2014-04-17 |
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| Record modified | 2020-05-29 |
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