SEMINARS |
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Fall 2006
STATISTICS
COLLOQUIUM
Wednesday, December 6, 2006
3:30-4:00—Refreshments, Yost 327
4:00-5:00—Talk,
Yost, Room 101
Heather Morrison, PhD
Department of Astronomy
CASE
Fashionably Late? Building up the Galaxy's Inner Halo
Measurements of 3-D positions and velocities of old stars give
astronomers a great deal of information from which they infer the
formation history of the Milky Way galaxy, because it is likely that
quantities such as energy and angular momentum are conserved for
at least some of the stars.
I will present a new, very high quality sample of data on nearby stars
from the galaxy's halo which shows much more substructure (on several
scales) than previous samples have ever shown. I will talk about
quantifying the substructure (work done in collaboration with Jiayang
Sun), and about the implications for formation of the galaxy's halo,
both by stars that arrive early in its history and those who, in
contrast, are "fashionably late".
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