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New VIRAC proper motion maps show signature of galactic boxy/peanut bulge

Published online by Cambridge University Press:  14 May 2020

Jonathan P. Clarke Open the ORCID record for Jonathan P. Clarke [Opens in a new window] ,
Christopher Wegg ,
Ortwin Gerhard Open the ORCID record for Ortwin Gerhard [Opens in a new window] ,
Leigh C. Smith ,
Phil W. Lucas  and
Shola M. Wylie
Jonathan P. Clarke
Affiliation:
MPI für Extraterrestrische Physik, Gießenbachstraße, D-85748 Garching, Germany email: jclarke@mpe.mpg.de
Christopher Wegg
Affiliation:
Laboratoire Lagrange, Université Côte d’ Azur, Observatoire de la Côte d’ Azur, CNRS, Bd de l’Observatoire, 06304 Nice, France
Ortwin Gerhard
Affiliation:
MPI für Extraterrestrische Physik, Gießenbachstraße, D-85748 Garching, Germany email: jclarke@mpe.mpg.de
Leigh C. Smith
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Rd, Cambridge, CB3 0HA, UK School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
Phil W. Lucas
Affiliation:
School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
Shola M. Wylie
Affiliation:
MPI für Extraterrestrische Physik, Gießenbachstraße, D-85748 Garching, Germany email: jclarke@mpe.mpg.de
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Abstract

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We have derived absolute proper motions of stars in the Galactic bulge region combining the VVV InfraRed Astrometric Catalogue (VIRAC) and Gaia. We use the proper motions to study the kinematic structure of the bulge both integrated along the line-of-sight and in magnitude intervals using red clump stars as standard candles. In parallel we compare to a made-to-measure barred dynamical model, folding in the VIRAC selection function, to understand and interpret the structures that we observe. The barred dynamical model, which contains a boxy/peanut bulge, and has a pattern speed of 37.5 kms−1 kpc−1, is able to reproduce all structures impressively well.

Keywords

Galaxy: bulgeGalaxy: kinematics and dynamicsGalaxy: structure
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. 29 - 30
Copyright
© International Astronomical Union 2020

References

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