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
(Tadayuki Kodama, Kumiko S. Usuda, Naoyuki Tamura, Tomonori Usuda)
by email : sseminar_at_subaru.naoj.org (please change"_at_" to @).
August 01, Monday, at 11:00 am
" Near-infrared spectroscopy of passively evolving galaxies at z>1.4 with Subaru/MOIRCS "
(ETH Zurich, Switzerland)
Typical spectroscopic surveys aiming at z>1.4 galaxies have been conducted with
optical instruments and targeting star-forming galaxies with relatively blue
in rest-frame UV. Thus, high redshift passive galaxies are almost fully missed
in these surveys because they are very faint in the optical and usually there
is no detectable emission line. In this respect, near-IR spectroscopy offers
a great advantage for passive galaxies at z>1.4 as strongest spectral features
such as 4000A break and Ca H+K absorption lines are redshifted into near-IR,
and rest-frame optical continuum is much brighter than that in the rest-frame
UV. By taking advantages of such nature of passive galaxies and the capability
of multi-object spectroscopy of MOIRCS on Subaru, we have carried out near-IR
spectroscopic observation of passively evolving galaxies at z>1.4. We have
selected a sample of massive BzK-selected passively evolving galaxies (pBzKs)
at z>1.4 from the COSMOS field and observed them with Subaru/MOIRCS.
With a exposure time ranging from 7.5 hours to 9.5 hours per object,
18 pBzKs among 34 observed in 3 masks have been identified spectroscopically.
I will show the results on their stellar populations based on broad-band
SEDs and rest-frame optical spectral features, environments, and velocity
dispersion analysis for the brightest object. I will also show average
properties of z>1.4 passive galaxies based on a composite spectrum of
Seminars are also held at JAC,