Astronomy and Astrophysics | VOL. 540
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3-dimensional kinematics in low foreground extinction windows of the Galactic bulge Radial velocities for six bulge fields: procedures and results ,

Publication Date Apr 1, 2012

Abstract

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.

Concepts

Galactic Bulge Integral Field Spectroscopy Low Extinction Windows Proper Motions Galactic Center Milky Way Kinematics Bulge Fields 3-dimensional Kinematics Stellar Bar

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