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The Subaru Seminar is
usually held in Room 104 of the Hilo Base Facility, adjacent
to the main lobby. Everyone is welcome to attend. If you are
interested in giving a seminar, please contact Subaru
seminar organizers (Tomonori Usuda, Kumiko S. Usuda, Masahiko Hayashi, Masayuki Akiyama)
by email.
Feburary 25, Friday at 11:00am
" Spectroscopic Studies of GOODS Ellipticals: Downsizing in the Context of Hierarchical Galaxy Formation"
Richard Ellis (Caltech)
The mass assembly history of elliptical galaxies is now a key issue in
addressing
the question of whether there is a crisis in the dark matter driven
picture of galaxy
formation. Should we be surprised by the claimed high abundance of
massive,
red-and-dead galaxies at redshift two in the light of contrary
predictions from
semi-analytic models where large ellipticals supposedly form late from
recent
mergers? I will describe a comprehensive dynamical study of nearly 200
distant
field ellipticals in the northern GOODS field which shows the plot
thickens. There
is now convincing evidence that massive systems are generally older than
their lower mass equivalents, in marked contrast to simple hierarchical
growth.
The implications of this and related recent evidence for `downsizing'
in galactic
assembly will be discussed.