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Transverse bar/bulge kinematics with Gaia and VVV

Published online by Cambridge University Press:  14 May 2020

Jason L. Sanders Open the ORCID record for Jason L. Sanders [Opens in a new window] ,
N. Wyn Evans ,
Leigh Smith  and
Philip Lucas
Jason L. Sanders
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK email: [email protected]
N. Wyn Evans
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK email: [email protected]
Leigh Smith
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK email: [email protected] School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
Philip Lucas
Affiliation:
School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
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Abstract

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We present new results on the Galactic bar/bulge transverse velocity structure using Gaia and the VISTA Variables in Via Lactea (VVV) survey. Gaia is complemented in high extinction regions by the multi-epoch infrared VVV observations for which derived relative proper motions can be tied to Gaia’s absolute frame. We extract kinematic maps (both 2D and 3D) of the Galactic bar/bulge, from which we measure the pattern speed of the bar using a novel technique. We focus on the evidence of an X-shaped bulge from the kinematic maps.

Keywords

Galaxy: structurebulgekinematics and dynamicsfundamental parameters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 38 - 42
Copyright
© International Astronomical Union 2020

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