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
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
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