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Measuring torque of galactic bar from Gaia DR2

Published online by Cambridge University Press:  14 May 2020

Rain Kipper Open the ORCID record for Rain Kipper [Opens in a new window]  and
Elmo Tempel
Rain Kipper
Affiliation:
Tartu Observatory, University of Tartu, Observatooriumi 1, 61602 Tõravere, Estonia email: [email protected]
Elmo Tempel
Affiliation:
Tartu Observatory, University of Tartu, Observatooriumi 1, 61602 Tõravere, Estonia email: [email protected]
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Abstract

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Since past few decades, observations have improved so strongly that when modelling Milky Way (MW) dynamics it is required to include small perturbations to the modelling process. It is difficult task that we try to solve by selecting regions to model so small that the perturbation can be considered to give nearly constant effect. We use Solar Neighbourhood (SN) as our test sample and assume that the bar effects show more or less constant contribution to SN. By extrapolating and smoothing observed stars on their orbits, and requiring that smoothed and observed phase space are consistent we were able to deduce acceleration vector. We conclude from non-radial acceleration component that the bar must cause about one third of total acceleration near SN.

Keywords

Galaxy: kinematics and dynamicsGalaxy: fundamental 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. 49 - 50
Copyright
© International Astronomical Union 2020

References

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