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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, Masayuki Akiyama)
by email : sseminar_at_subaru.naoj.org (please change"_at" to @).
March 08, Thursday at 11:00 am
" Luminosity Dependent Clustering of Star-Forming BzK Galaxies at Redshift 2 "
Masao Hayashi
(University of Tokyo)
We apply the BzK color selection technique proposed
by Daddi et al. (2004) to deep multiwavelength data
in the Subaru Deep Field, and obtain a sample of 1092
faint star-forming BzK galaxies (sBzKs) for 180 arcmin^2.
This sample represents star-forming galaxies at
1.4 < z < 2.5 down to K(AB)=23.2,
which roughly corresponds to a stellar-mass limit of ~1 x 10^{10} Msun.
We measure the angular correlation function of
these sBzKs to be w(theta) = (0.58 +- 0.13) x theta["]^{-0.8}
and translate the amplitude into the correlation length
assuming a reasonable redshift distribution.
The resulting value, r_0 = 3.2^{+0.6}_{-0.7} h^{-1} Mpc,
suggests that our sBzKs reside in haloes with a typical
mass of 2.8 x 10^{11} Msun.
Combining this halo mass estimate with those for
brighter samples of Kong et al. (2006), we find
that the mass of dark haloes largely increases
with K brightness, a measure of the stellar mass.
Comparison with other galaxy populations suggests
that faint sBzKs (K(AB)<23.2) and Lyman Break Galaxies
at z ~ 2 are similar populations hosted
by relatively low-mass haloes.
Using the extended Press-Schechter formalism,
we predict that present-day descendants of haloes hosting sBzKs
span a wide mass range depending on K brightness,
from lower than that of the Milky Way up to those of richest clusters.