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- Title
ROTATION OF THE MILKY WAY AND THE FORMATION OF THE MAGELLANIC STREAM.
- Authors
Růžička, A.; Theis, C.; Palouš, J.
- Abstract
We studied the impact of the revisited values for the LSR circular velocity of the Milky Way (Reid et al. 2004) on the formation of the Magellanic Stream. The LSR circular velocity was varied within its observational uncertainties as a free parameter of the interaction between the Large (LMC) and the Small (SMC) Magellanic Clouds and the Galaxy. We have shown that the large-scale morphology and kinematics of the Magellanic Stream may be reproduced as tidal features, assuming the recent values of the proper motions of the Magellanic Clouds (Kallivayalil et al. 2006). Automated exploration of the entire parameter space for the interaction was performed to identify all parameter combinations that allow for modeling the Magellanic Stream. Satisfactory models exist for the dynamical mass of the Milky Way within a wide range of 0.6 ⋅ 1012 Mʘ to 3.0 ⋅ 1012 Mʘ and over the entire l-σ errors of the proper motions of the Clouds. However, the successful models share a common interaction scenario. The Magellanic Clouds are satellites of the Milky Way, and in all cases two close LMC-SMC encounters occurred within the last 4 Gyr at t < -2.5 Gyr and t ≈ -150 Myr, triggering the formation of the Stream and of the Magellanic Bridge, respectively. The latter encounter is encoded in the observed proper motions and inevitable in any model of the interaction. We conclude that the tidal origin of the Magellanic Stream implies the previously introduced LMC/SMC orbital history, unless the parameters of the interaction are revised substantially.
- Subjects
DIFFUSE ionized gas (Astronomy); GALACTIC coordinates; MILKY Way; DARK matter; STELLAR oscillations; MAGELLANIC clouds
- Publication
EAS Publications Series, 2011, Vol 48, p337
- ISSN
1633-4760
- Publication type
Article
- DOI
10.1051/eas/1148076