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Dynamics of the Milky Way Bar/Bulge

Published online by Cambridge University Press:  14 May 2020

Ortwin Gerhard Open the ORCID record for Ortwin Gerhard [Opens in a new window]
Ortwin Gerhard*
Affiliation:
Max-Planck-Institute for Ex. Physics, Giessenbachstr. 1, D-85748 Garching, Germany email: gerhard@mpe.mpg.de
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Abstract

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Stellar surveys and dynamical models have recently led to important progress on understanding the dynamical structure of the Milky Way’s bar and central box/peanut bulge. This talk briefly reviews the density structure of the bulge and bar from star count tomography, the cylindrical rotation of bulge stars, and the measurements of their stellar masses and pattern speed that have been obtained by fitting dynamical models to the combined star count and line-of-sight velocity data. Recent work deriving absolute proper motions throughout the bulge from the VIRAC survey and Gaia has led to a new 3D measurement of the barred bulge kinematics which is expected to greatly improve the dynamical models, and has already confirmed the relatively slow pattern speed (∼40 kms−1 kpc−1) obtained from the previous dynamical and gas-dynamical modelling.

Keywords

Galaxy: structurekinematics and dynamicsstellar contentdark mattergalaxies: evolutionformation
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. 26 - 28
Copyright
© International Astronomical Union 2020

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