Seminário Extra 08/07/2022: The Magellanic Clouds history as told by VISCACHA clusters

Sobre este evento

The Large and Small Magellanic Clouds (LMC, SMC) are in their first infall to the Milky Way. This is the new paradigm for the history of the Magellanic Clouds since the seminal work by Besla et al, which supersedes the classical scenario where LMC and SMC have been orbiting the Milky Way and only recently they became a pair. Since then, there is evidence from many independent studies that support the first infall scenario. For example, the LMC+SMC orbit is traced by the 200 degree wide Magellanic Stream made up of HI gas, that is reproduced by first infall models. A local wake and a Northern overdensity of stars in the Milky Way halo has been detected, and it is only explained by the first infall scenario. A slow star formation efficiency followed by a recent starburst was detected and it is consistent with the first infall scenario. The next step is to determine the details of the internal structure and kinematics of the LMC, SMC and Bridge that are required to refine the models. We use star clusters within the VISCACHA survey to produce a 3D map of the LMC and SMC outskirts to trace the effects of the past interactions between LMC-SMC and the Milky Way, including a spectroscopic follow-up with GMOS/Gemini-S that is key for the kinematics. Star clusters are very useful tools, because they provide precise distance, age, metallicity, radial velocity. In this talk, I will make a review of the field, present the VISCACHA survey, and show some interesting results.