THE IMPRINTS OF THE GALACTIC BAR ON THE THICK DISK WITH RAVE

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THE IMPRINTS OF THE GALACTIC BAR ON THE THICK DISK WITH RAVE

Antoja, T; Monari, G; Helmi, A; Bienayme, O; Bland-Hawthorn, J; Famaey, B; Gibson, BK; ... Zwitter, T; + view all (2015) THE IMPRINTS OF THE GALACTIC BAR ON THE THICK DISK WITH RAVE. The Astrophysical Journal Letters , 800 (2) , Article L32. 10.1088/2041-8205/800/2/L32. Green open access

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Abstract

We study the kinematics of a local sample of stars, located within a cylinder of $500\;{\rm pc}$ radius centered on the Sun, in the RAVE data set. We find clear asymmetries in the ${{v}_{R}}$ - ${{v}_{\phi }}$ velocity distributions of thin and thick disk stars: there are more stars moving radially outward for low azimuthal velocities and more radially inward for high azimuthal velocities. Such asymmetries have been previously reported for the thin disk as being due to the Galactic bar, but this is the first time that the same type of structures are seen in the thick disk. Our findings imply that the velocities of thick-disk stars should no longer be described by Schwarzschild's, multivariate Gaussian or purely axisymmetric distributions. Furthermore, the nature of previously reported substructures in the thick disk needs to be revisited as these could be associated with dynamical resonances rather than to accretion events. It is clear that dynamical models of the Galaxy must fit the 3D velocity distributions of the disks, rather than the projected 1D, if we are to understand the Galaxy fully.

Type:	Article
Title:	THE IMPRINTS OF THE GALACTIC BAR ON THE THICK DISK WITH RAVE
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1088/2041-8205/800/2/L32
Publisher version:	https://doi.org/10.1088/2041-8205/800/2/L32
Language:	English
Additional information:	This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI:	https://discovery.ucl.ac.uk/id/eprint/10076671