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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.

Seminars are also held at JAC, CFHT, and IfA.

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