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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.
March 20, Monday at 11:00am
" The evolution of galaxies from primeval irregulars to present-day ellipticals "
Masao Mori
(UCLA/Sensyu Univ.)
The current understanding of galaxy formation is that it proceeds
in a 'bottom up' way, with the formation of small clumps of gas and
stars that merge hierarchically until giant galaxies are built up.
The baryonic gas loses the thermal energy by radiative cooling and
falls towards the centres of the new galaxies, while supernovae
blow gas out. Any realistic model therefore requires a proper treatment
of these processes, but hitherto this has been far from satisfactory.
Here I report an ultra-high-resolution simulation that follows evolution
from the earliest stages of galaxy formation through the period of
dynamical relaxation. The bubble structures of gas revealed in our
simulation(< 10^8 years) resemble closely the high-redshift
Lyman alpha emitters. After 10^9 years these bodies are dominated by
stellar continuum radiation and look like the Lyman break galaxies
known as the high-redshift star-forming galaxies at which point the
abundance of heavy elements appears to be solar. After 1.10^10 years,
these galaxies resemble present-day ellipticals.