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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.
January 28, Friday at 11:00am
" Discovery of a large-scale clumpy structure around the Lynx supercluster at z~1.27"
Fumiaki Nakata (NAOJ, Mitaka)
We report the discovery of a probable large scale structure composed
of many galaxy clumps around the known twin clusters at z=1.26 and z=1.27
in the Lynx region. Our analysis is based on deep, panoramic, and
multi-colour imaging (26.4'x24.1') in VRi'z'-bands with the Suprime-Cam
on the 8.2m Subaru telescope. This unique, deep and wide-field imaging
data-set allows us for the first time to map out the galaxy distribution
in the highest redshift supercluster known. We apply a photometric
redshift technique to extract plausible cluster members at z~1.27
down to i'=26.15 (5sigma) corresponding to ~M*+2.5 at this redshift.
From the 2-D distribution of these photometrically selected galaxies, we
newly identify seven candidates of galaxy groups or clusters where
the surface density of red galaxies is significantly high (>5sigma),
in addition to the two known clusters. These candidates show clear red
colour-magnitude sequences consistent with a passive evolution model,
which suggests the existence of additional high density regions around the
Lynx superclusters.