3-Dimensional Kinematics in low foreground extinction windows of the Galactic Bulge: Radial Velocities for 6 bulge fields

Abstract

The detailed structure of the Galactic bulge still remain 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. 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. 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.

14 pages, 15 figures, Accepted for publication in A&A

References in corpus (10)

• Stellar Proper Motions in the Galactic Bulge from deep HST ACS/WFC Photometry
• Modelling the Galactic bar using OGLE-II Red Clump Giant Stars
• Mapping the X-Shaped Milky Way Bulge
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• Unifying boxy bulge and planar long bar in the Milky Way
• The Bulge Radial Velocity Assay (BRAVA): I. Sample Selection and a Rotation Curve
• The long Galactic bar as seen by UKIDSS Galactic Plane Survey
• Evidence of a Metal Rich Galactic Bar from the Vertex Deviation of the Velocity Ellipsoid
• Proper Motion Dispersions of Red Clump Giants in the Galactic Bulge: Observations and Model Comparisons
• Mapping stellar kinematics across the Galactic bar: HST measurements of proper motions in 35 fields

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• A Schwarzschild model of the Galactic bar with initial density from N-body simulations
• Chemically-dissected rotation curves of the Galactic Bulge from Main Sequence proper motions
• Kinematics of the X-shaped Milky Way Bulge: Expectations from a Self-consistent N-body Model
• Mapping the tilt of the Milky Way bulge velocity ellipsoids with ARGOS and $Gaia$ DR2
• Proper motions for HST observations in three off-axis bulge fields
• Distance to the Brick cloud using stellar kinematics
• More pieces of the puzzle: Chemistry and substructures in the Galactic thick disk
• The chemical and spatial variations of the bulge's velocity ellipsoids
• Blanco DECam Bulge Survey (BDBS) IV: Metallicity Distributions and Bulge Structure from 2.6 Million Red Clump Stars