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Velocity-space substructure from nearby RAVE and SDSS stars

By Chang Hoon Hahn, J. A. Sellwood and Carlton Pryor

Abstract

We extract a sample of disc stars within 200 pc of the Sun from the RAVE and SDSS surveys. Distances are estimated photometrically and proper motions are from ground-based data. We show that the velocity-space substructure first revealed in the Geneva-Copenhagen sample is also present in this completely independent sample. We also evaluate action-angle variables for these stars and show that the Hyades stream stars in these data are again characteristic of having been scattered at a Lindblad resonance. Unfortunately, analysis of such local samples can determine neither whether it is an inner or an outer Lindblad resonance, nor the multiplicity of the pattern.Comment: Included copy editor's corrections. Accepted to appear in MNRAS. 9 pages, 11 figures, uses mn2e LaTe

Topics: Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics
Year: 2011
DOI identifier: 10.1111/j.1365-2966.2011.19633.x
OAI identifier: oai:arXiv.org:1102.4626
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