Antoja, T; Helmi, Amina; Dehnen, W; Bienayme, O; Bland-Hawthorn, Jonathan; Famaey, Benoit; Freeman, Kenneth; Munari, U; Steinmetz, M.; Wyse, Rosemary F G; Zwitter, T
Non-axisymmetries in the Galactic potential (spiral arms and bar) induce kinematic groups such as the Hercules stream. Assuming that Hercules is caused by the effects of the outer Lindblad resonance of the Galactic bar, we model analytically its properties as a function of position in the Galaxy and its dependence on the bar's pattern speed and orientation. Using data from the RAVE survey we find that the azimuthal velocity of the Hercules structure decreases as a function of Galactocentric...[Show more]
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