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SUMMARY:Where's the Matter? (Tails from the Milky Way's destructive past) 
 - Kathryn Johnston (Columbia)
DTSTART:20140424T153000Z
DTEND:20140424T163000Z
UID:TALK51557@talks.cam.ac.uk
CONTACT:Simon Hodgkin
DESCRIPTION:A major accomplishment for large scale stellar surveys of the 
 Milky Way has been the discovery of a multitude of debris structures from 
 dead and dying satellites encircling our Galaxy. These structures unequivo
 cally demonstrate the Milky Way's cannibalistic history\, in agreement wit
 h our understanding of how structure formation proceeds in the Universe mo
 re generally. They also delve deep into our dark matter halo and provide i
 nvaluable probes of its mass distribution. This idea is particularly inter
 esting at the moment with the prospect of significant improvements to the 
 quantity\, quality and dimensionality of stellar data sets that map debris
 . Recently\, there has been renewed vigor in developing and testing techni
 ques that can use this data to\nplace rigorous constraints on the large-sc
 ale structure of our dark matter halo. While the Milky Way is "just one ga
 laxy" it is the only one where we can hope to measure the 3-dimensional st
 ructure of a dark matter halo -  not just the overall mass\, but the shape
 \, orientation and density as a function of radius. In this talk I will de
 scribe the properties that make debris structures  such effective potentia
 l probes and outline the observational and analytical efforts being made t
 o exploit these properties and pin down exactly where the matter is around
  our Galaxy.
LOCATION:Sackler Lecture Theatre\, IoA (tea at 4:00 pm)
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