The Hercules moving group's angular momentum decreases toward the bar's major axis in Gaia DR2 data, matching the corotation-resonance prediction of a slowly rotating, dynamically old bar.
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Tracing Hercules in Galactic azimuth with Gaia DR2
The Hercules moving group's angular momentum decreases toward the bar's major axis in Gaia DR2 data, matching the corotation-resonance prediction of a slowly rotating, dynamically old bar.