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Title:
Is the Milky Way ringing? The hunt for high-velocity streams
Authors:
Minchev, I.; Quillen, A. C.; Williams, M.; Freeman, K. C.; Nordhaus, J.; Siebert, A.; Bienaymé, O.
Affiliation:
AA(Université de Strasbourg, CNRS, Observatoire Astronomique, 67000 Strasbourg, France), AB(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA), AC(Mount Stromlo Observatory, Australian National University, Cotter Road, ACT 2611, Australia; Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany), AD(Australian National University, Canberra, ACT 200, Australia), AE(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA), AF(Université de Strasbourg, CNRS, Observatoire Astronomique, 67000 Strasbourg, France), AG(Université de Strasbourg, CNRS, Observatoire Astronomique, 67000 Strasbourg, France)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 396, Issue 1, pp. L56-L60. (MNRAS Homepage)
Publication Date:
06/2009
Origin:
MNRAS
MNRAS Keywords:
stellar dynamics, Galaxy: evolution, Galaxy: kinematics and dynamicsn, solar neighbourhood, galaxies: evolution
DOI:
10.1111/j.1745-3933.2009.00661.x
Bibliographic Code:
2009MNRAS.396L..56M

Abstract

We perform numerical simulations of a stellar galactic disc with initial conditions chosen to represent an unrelaxed population which might have been left following a merger. Stars are unevenly distributed in radial action angle, though the disc is axisymmetric. The velocity distribution in the simulated solar neighbourhood exhibits waves travelling in the direction of positive v, where u, v are the radial and tangential velocity components. As the system relaxes and structure wraps in phase space, the features seen in the u-v plane move closer together. We show that these results can be obtained also by a semi-analytical method. We propose that this model could provide an explanation for the high-velocity streams seen in the solar neighbourhood at approximate v in kms-1, of -60 (HR1614), -80, -100 (Arcturus) and -160. In addition, we predict four new features at v ~ -140, -120, 40 and 60kms-1. By matching the number and positions of the observed streams, we estimate that the Milky Way disc was strongly perturbed ~1.9Gyr ago. This event could have been associated with Galactic bar formation.
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