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SUMMARY:Deconstructing stellar halos in the Local Group - Alan McConnachie
  (U Vic)
DTSTART:20190314T160000Z
DTEND:20190314T170000Z
UID:TALK118429@talks.cam.ac.uk
CONTACT:28811
DESCRIPTION:The success of the LCDM cosmological model on large scales is\
 nimpressive. Therefore\, the past years have seen increased focus on the\n
 testing of the model on galactic scales and smaller.  Here\, it appears\ng
 alaxy formation proceeds hierarchically. Since the dynamical times of\ngal
 axies in their outer regions are long\, it is possible to identify fossils
 \nof the formation process in their distant stellar halos.  Many of the\np
 redicted features of galaxies\, such as faint satellites and diffuse stell
 ar\nhaloes\, are extremely low surface brightness\, and so the Milky Way\,
  M31 and\nM33 are some of the only large galaxies in the Universe that can
  provide\nrobust tests of many fundamental aspects of galaxy formation mod
 els. I will\ndiscuss our detailed understanding of stellar halos based on 
 final results\nfrom the Pan-Andromeda Archaeological Survey (PAndAS)\, a  
 deep photometric\nsurvey that has surveyed nearly 400 sq.degrees in the su
 rroundings of the\nM31/M33 sub-group. I will compare these finding to the 
 Milky Way\, and show\nresults from  a new survey – the Canada-France Ima
 ging Survey (CFIS) – that\nis probing the outermost regions of the disk 
 and halo of the Milky Way. I\nwill also demonstrate how CFIS can be used t
 o best exploit Gaia for the\nfaintest targets where Gaia parallaxes are ve
 ry poor. Finally\, I will show\nhow CFIS is being used as a training set f
 or LSST\, and discuss how to best\ncomplement the wealth of imaging data w
 ith much needed wide field\, deep\,\nspectroscopic observations.
LOCATION:Sackler Lecture Theatre\, IoA (tea at 3:30 pm)
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