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- W4207047247 abstract "ABSTRACT Gaia DR2 has revealed breathing motions in the Milky Way, with stars on both sides of the Galactic mid-plane moving coherently towards or away from it. The generating mechanism of these breathing motions is thought to be spiral density waves. Here, we test this hypothesis. Using a self-consistent, high-resolution simulation with star formation, and which hosts prominent spirals, we first study the signatures of breathing motions excited by spirals. In the model, the breathing motions induced by the spiral structure have an increasing amplitude with distance from the mid-plane, pointing to an internal cause for them. We then show that, at fixed height, the breathing motion amplitude decreases with age. Next, we investigate the signature of the breathing motions in the Gaia DR2 data set. We demonstrate that, at the location with a consistently large breathing motion, the corresponding amplitude increases monotonically with distance from the mid-plane, in agreement with the model. Furthermore, we show that at the same location, the breathing motion amplitude decreases with age, again similar to what we find in the model. This strengthens the case that the observed breathing motions are driven by spiral density waves." @default.
- W4207047247 created "2022-01-26" @default.
- W4207047247 creator A5002224962 @default.
- W4207047247 creator A5015654292 @default.
- W4207047247 creator A5034738938 @default.
- W4207047247 date "2022-01-27" @default.
- W4207047247 modified "2023-10-14" @default.
- W4207047247 title "Age dissection of the vertical breathing motions in <i>Gaia</i> DR2: evidence for spiral driving" @default.
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- W4207047247 doi "https://doi.org/10.1093/mnras/stac137" @default.
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