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BEGIN:VEVENT
DTSTAMP:20260627T142307Z
DTSTART;VALUE=DATE-TIME:20140402T134500
DTEND;VALUE=DATE-TIME:20140402T144500
SUMMARY:Astro Seminar
TZID:Europe/London
UID:20140402-094d43454503faa5014517eddfe7693f@warwick.ac.uk
CREATED:20140331T113716Z
DESCRIPTION:Prof. Wyn Evans (IoA Cambridge) A Ghost Story: The Halo of th
 e Milky Way Galaxy The history of the Galaxy is imprinted in the kinemat
 ics and chemical properties of the stars in the stellar halo. Their stud
 y allows us partially to reconstruct the Galactic past because the time 
 required for stars in the halo to exchange their energies and momenta is
  very long compared with the age of the Galaxy. This field has been revo
 lutionised in recent years by data from the Sloan Digital Sky Survey Dat
 a\, which has revealed a super-abundance of substructure. There are ghos
 tly streams from disrupting dwarf galaxies and globular clusters\, analo
 gues of meteor streams along old cometary paths in the Solar. There are 
 ultrafaint phantom galaxies composed of old and faint stars\, so puny th
 at the entire galaxy is outshone by a single red giant star. There are s
 mooth\, flattened\, halo populations\, such as the blue horizontal branc
 h stars. Dominating the Galactic halo\, there is the magnificent double 
 arch of the Sagittarius stream criss-crossing the whole sky. These trace
 rs enable the study of the assembly of the Galaxy\, as well as its prese
 nt-day mass and gravitational field. The quality of the data permit conf
 rontation -- and conflict -- with modern-day cosmological simulations of
  galaxy formation.
LOCATION:PS 1.28
CATEGORIES:Astronomy Seminar
LAST-MODIFIED:20140331T113716Z
ORGANIZER;CN=Roberto Raddi:
END:VEVENT
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