Kinematic groups beyond the Solar neighbourhood with RAVE
Abstract
We analyse the kinematics of disc stars observed by the RAVE survey in and beyond the Solar neighbourhood.We detect significant overdensities in the velocity distributions using a technique based on the wavelet transform.We find that the main local kinematic groups are large scale features, surviving at least up to ~1 kpc from the Sun in the direction of anti-rotation, and also at ~700 pc below the Galactic plane.We also find that for regions located at different radii than the Sun, the known groups appear shifted in the velocity plane. For example, the Hercules group has a larger azimuthal velocity for regions inside the Solar circle and a lower value outside. We have also discovered a new group at (U, V) = (92,-22) km/s in the Solar neighbourhood and confirmed the significance of other previously found groups. Some of these trends detected for the first time are consistent with dynamical models of the effects of the bar and the spiral arms. More modelling is required to definitively characterise the non-axisymmetric components of our Galaxy using these groups.
Keywords
Cite
@article{arxiv.1205.0546,
title = {Kinematic groups beyond the Solar neighbourhood with RAVE},
author = {T. Antoja and A. Helmi and O. Bienayme and J. Bland-Hawthorn and B. Famaey and K. Freeman and B. K. Gibson and G. Gilmore and E. K. Grebel and I. Minchev and U. Munari and J. Navarro and Q. Parker and W. Reid and G. M. Seabroke and A. Siebert and A. Siviero and M. Steinmetz and M. Williams and R. Wyse and T. Zwitter},
journal= {arXiv preprint arXiv:1205.0546},
year = {2015}
}
Comments
Minor changes to match the accepted version in MNRAS Letters