In this presentation, we will give an overview of Subaru FMOS and its
current commissioning status. FMOS is a fiber-fed multi-object
spectrograph, exploiting the unique combination of large
light-gathering power and wide field of view at Subaru. The 400 fibers
are available to configure across the 30 arcmin diameter field of view
at the Subaru prime focus. The spectral coverage of the spectrograph
is from 0.9 to 1.8 microns with an OH airglow suppression mechanism,
which will enable one to observe major redshifted emission and
absorption lines in the rest-frame optical bands from galaxies at
redshifts at z>1. Since the engineering first light achieved in May
2008, we have been testing the instrument for stable and optimal
operation and, in particular, the typical positional accuracy of
fibers is now ~0".2 in RMS after a 15min configuration time. Recently
we succeeded in observing faint objects with auto guiding as well as
bright stars in cluster fields and more data will be accumulated in
the forthcoming engineering runs to verify the performance.
-infrared instruments on our present understanding of massive star formation will be discussed.