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, Masayuki Akiyama)
by email : sseminar_at_subaru.naoj.org (please change"_at" to @).
November 20, Tuesday at 11:00 am
" The build-up of the red sequence "
Masayuki Tanaka (ESO)
We discuss the environmental dependence of galaxy colors at z<1.3
and show that galaxies follow the "environment-dependent down-sizing"
evolution. We suggest that galaxy-galaxy interactions may be
the primary driver of this evolution.
We are conducting a panoramic imaging and spectroscopic survey of
galaxy clusters at 0.5
What physical process(es) drives the observed build-up of the red sequence?
We address this question with composite spectra of red galaxies in field,
group, and cluster environments at z<0.83. Red galaxies in groups at z~0.8
and in the field z~0.5 show strong Hd absorptions for their colors.
Interestingly, these are the environments in which we observe the on-going
build-up of the red sequence. The strong Hd absorptions imply that their
star formation rates decreased on a relatively short time scale (<1Gyr).
We suggest that galaxy-galaxy interactions are likely the driving process
of the truncation of the star formation activities and the build-up
of the red sequence.
Seminars are also held at JAC,