2009/11/30 by Maura Brunetti, M. Brunetti, D. Pfenniger +1
Physics and Astronomy · #Astronomy and Astrophysical Research #Bulge #Galactic Center #Galactic corona #Galactic halo #Galactic plane #Galactic tide #Galaxy #Milky Way #Proper motion #Scientific Research and Discoveries #Stellar, planetary, and galactic studies #astro-ph.GA
paper · pdf · doi:10.1051/0004-6361/200913656
7 pages, 9 figures. Accepted for publication in Astron. & Astrophys
arxiv created 2009/12/16 · openalex publication_date 2009/12/21 · arxiv updated 2015/05/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We analyse the radial and tangential velocity fields in the Galaxy as seen from the Sun by using as a first approximation a simple axisymmetric model, which we then compare with the corresponding fields in a barred <i>N<i/>-body model of the Milky Way. This provides a global description of these quantities missing in the literature, showing where they take large values susceptible to be used in future observations even for sources well beyond the Galactic center. Absolute largest proper motions occur at a distance slightly behind the Galactic center, which are there 1.5 times larger than the highest local proper motions due to the Galactic differential rotation. Large proper motions well beyond the Galactic center are well within the current astrometric accuracy.