Volume 540, April 2012
|Number of page(s)||13|
|Section||Galactic structure, stellar clusters and populations|
|Published online||23 March 2012|
3-dimensional kinematics in low foreground extinction windows of the Galactic bulge
Radial velocities for six bulge fields: procedures and results ⋆,⋆⋆
1 Leiden Observatory, Leiden University, PO Box 9513, 2300RA Leiden, The Netherlands
2 Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1547, USA
3 Departamento de Física, Universidad de la Serena, Benavente 980, La Serena, Chile
Received: 15 January 2011
Accepted: 27 January 2012
Aims. The detailed structure of the Galactic bulge still remains uncertain. The strong difficulties of obtaining observations of stars in the Galactic bulge have hindered the acquisition of a kinematic representation for the inner kpc of the Milky Way. The observation of the 3-d kinematics in several low foreground extinction windows can solve this problem.
Methods. We have developed a new technique, which combines precise stellar HST positions and proper motions with integral field spectroscopy, in order to obtain reliable 3-d stellar kinematics in crowded fields of the Galactic center.
Results. In addition, we present results using the new techniques for six fields in our project. A significant vertex deviation has been found in some of the fields in agreement with previous determinations. This result confirms the presence of a stellar bar in the Galactic bulge.
Key words: Galaxy: bulge / Galaxy: kinematics and dynamics / Galaxy: structure
Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile. European Southern Observatory (ESO) programme numbers 71.B-3048(A), 077.B-0600(A) and 079.B-0232(A).
Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-2655. These observations are associated with proposals GO-8250, GO-9436, GO-9816 and GO-11655.
© ESO, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.