Publications of the Astronomical Society of the Pacific, Vol122 pp.103, 2010
H. Sugai(Kyoto Univ), et al.
Abstract:
In order to investigate physical conditions of ionized gas in galaxies, as well as
its kinematics, we have developed the Kyoto tridimensional spectrograph II. It is a
multi-mode optical instrument, including integral field spectrograph (IFS) and
Fabry-Perot imager modes. We have designed it compact so that we can mount it on
2-m class telescopes as well as on 8.2-m Subaru telescope. A special care was taken
for realizing high-quality calibrations in the IFS mode. In order to remove the
chromatic aberration of micropupil images produced by a lenslet array, we have
introduced a corrector lens system behind the lenslet array. The internal calibration
system simulates the telescope optics so that the system provides micropupil images
identical to those produced by the telescope. The rigidness of the instrument provides
the positional stability of micropupil images. We have succeeded in test observations
of all the modes on Subaru and the University of Hawaii 88-inch (UH88) telescopes
and have verified the performance of the instrument. This includes the instrument
efficiencies as well as the effective sky background subtraction and the minimization
of crosstalk effects in the IFS mode. In the IFS mode a spatial resolution of 0".4 was
obtained in good seeing conditions. Each of 37 ×37 lenslets subtends0".1 in Subaru's
case. This samples well the image size. A wider field of view is emphasized in the
case of UH88.
