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Connecting Moving Groups to the Bar and Spiral Arms of the Milky Way

Published online by Cambridge University Press:  21 October 2010

T. Antoja ,
O. Valenzuela ,
F. Figueras ,
B. Pichardo  and
E. Moreno
T. Antoja
Affiliation:
DAM and IEEC-UB, ICC-Universitat de Barcelona, Spain, email: [email protected]
O. Valenzuela
Affiliation:
Instituto de Astronomia de la UNAM, Mexico, email: [email protected]
F. Figueras
Affiliation:
DAM and IEEC-UB, ICC-Universitat de Barcelona, Spain, email: [email protected]
B. Pichardo
Affiliation:
Instituto de Astronomia de la UNAM, Mexico, email: [email protected]
E. Moreno
Affiliation:
Instituto de Astronomia de la UNAM, Mexico, email: [email protected]
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Abstract

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We use test-particle orbit integration with a realistic Milky Way (MW) potential to study the effect of the resonances of the Galactic bar and spiral arms on the velocity distribution of the Solar Neighbourhood and other positions of the disk. Our results show that spiral arms create abundant kinematic substructure and crowd stars into the region of the Hercules moving group in the velocity plane. Bar resonances can contribute to the origin of low-angular momentum moving groups like Arcturus. Particles in the predicted dark disk of the MW should be affected by the same resonances as stars, triggering dark-matter moving groups in the disk. Finally, we evaluate how this study will be advanced by upcoming Gaia data.

Keywords

Galaxy: diskkinematics and dynamicsstructuresolar neighborhooddark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 192
Copyright
Copyright © International Astronomical Union 2010

References

Antoja, T., Figueras, F., Fernández, F., et al. 2008, A&A, 490, 135Google Scholar
Antoja, T., Valenzuela, O., Pichardo, B. et al. 2009, ApJL, 700, 78CrossRefGoogle Scholar