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SUMMARY:The satellites of the Milky Way - Gabriel Torrealba (Institute of 
 Astronomy)
DTSTART:20161018T183000Z
DTEND:20161018T193000Z
UID:TALK68234@talks.cam.ac.uk
CONTACT:Andrew Sellek
DESCRIPTION:The standard model of cosmology states that the dark matter pr
 esent in the Universe consists of particles that only interact gravitation
 ally. This model is extremely successful in explaining the large scale str
 ucture\, from the Cosmic Microwave Background\, to how galaxies distribute
  in the Universe. At small scales\, however\, it fails to reproduce our ob
 servations. If this mismatch is due to the simplicity of our simulations\,
  a fundamental flaw in the models\, or simply a lack of observational cons
 trains\, is still a matter of debate.\nIn the context of the cold dark mat
 ter paradigm\, all structure formation is dominated by dark matter\, which
  clumps together to form halos that host galaxies. This process of formati
 on of galaxies is hierarchical: small galaxies are formed first to then be
 come the building blocks of bigger galaxies through merging and accretion.
  This process is not innocuous\, when the dwarfs (the smaller galaxies) ar
 e dragged into the deeper potential wells\, most will be destroyed by the 
 tidal forces exerted upon them\, leaving trails and shells of their former
  stars in the process. These remnants will eventually mix well enough to f
 inally became part of their new host. However\, some may resist this proce
 ss of accretion and survive to become satellites orbiting the larger galax
 y. These signatures\, fossils of the process of galactic formation\, provi
 de invaluable information to unveil the details of the formation of galaxi
 es and can be used as the tools to constrain our models\nof the Universe. 
 To study this signatures in detail\, we have our own backyard laboraory: t
 he Milky Way and the local group.
LOCATION:Wolfson Lecture Theatre\, Department of Chemistry
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