The Vertical Displacement of the Milky Way Disk
Heidi Jo Newberg, Yan Xu
TL;DR
This paper reports the discovery of vertical oscillations in the Milky Way disk, likely caused by interactions with dwarf satellites, which may explain features like the Monoceros Ring and relate to spiral structure.
Contribution
It provides observational evidence of vertical oscillations in the Milky Way disk and discusses their possible origins and implications.
Findings
Vertical oscillations with ~8 kpc wavelength and ~100 pc amplitude observed.
Oscillations increase with distance from Galactic center.
Potential link to dwarf satellite perturbations and spiral structure.
Abstract
An oscillating vertical displacement of the Milky Way, with a wavelength of about 8 kpc and and amplitude of about 100 pc (increasing with distance from the Galactic center) is observed towards the Galactic anticenter. These oscillations are thought to be the result of disk perturbations from dwarf satellites of the Milky Way. They explain the Monoceros Ring and could be related to Milky Way spiral structure.
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