Evidence for a signature of the galactic bar in the solar neighbourhood

Details Evidence for a signature of the galactic bar in the solar neighbourhood Evidence for a signature of the galactic bar in the solar neighbourhood

1998-02-20

arxiv.org/abs/astro-ph/9802266v2

Astronomy and Astrophysics

Astrophysics

Letter (4 pages, 6 figures). Revised version: modifications in the text and in figure 1. Accepted for publication in A&A Lette

Scientific paper

Using available kinematical data for a subsample of NLTT stars from the HIPPARCOS mission we confirm the existence of a previously reported local anomaly in the (u,v) plane: the mean motion u for old disc stars, with v < -30 km/s, is largely positive (+19 +/- 9 km/s w.r.t. the Galactic Center). With the use of the newest global self-consistent numerical models of our Galaxy, we show that a bar could be responsible for this observed velocity anomaly. A fraction of our stars have bar perturbed ``hot'' orbits, allowing them to erratically wander from inside the bar to regions outside the corotation, in particular through the solar neighbourhood.

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