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Galactoseismology in the Age of Gaia

Published online by Cambridge University Press:  02 August 2018

Lawrence M. Widrow  and
Matthew H. Chequers
Lawrence M. Widrow
Affiliation:
Department of Physics, Engineering Physics, and Astronomy, Queen’s University, Kingston, Ontario, Canada, K7L 3N6 email: widrow@queensu.ca, 12mhc@queensu.ca
Matthew H. Chequers
Affiliation:
Department of Physics, Engineering Physics, and Astronomy, Queen’s University, Kingston, Ontario, Canada, K7L 3N6 email: widrow@queensu.ca, 12mhc@queensu.ca
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Abstract

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Recent observations from SEGUE, RAVE, and LAMOST have revealed tantalizing evidence that the local stellar disk of the Milky Way is in a state of disequilibrium. In particular, the disk appears to exhibit bending and breathing waves normal to its midplane within 2 kiloparsecs of our position within the disk. There also appear to be bending waves or corrugations at larger Galactocentric radii. These waves may be linked to other time-dependent disk phenomena such as the bar, spiral structure, and warp, or they may be the result of a passing dark matter subhalo or dwarf galaxy. Here, we discuss the observational evidence for these waves, the theory of bending and breathing waves in (simulated) stellar disks, and implications of disequilibrium for attempts to determine the local vertical force and dark matter density (the Oort problem). We also discuss the types of analyses that one might do with the Gaia database.

Keywords

galaxies: kinematics and dynamicsgalaxies: evolutiongalaxies: structureGalaxy: diskGalaxy: structureGalaxy: kinematics and dynamicsGalaxy: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 189 - 194
Copyright
Copyright © International Astronomical Union 2018 

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