Publications of the Astronomical Society of the Pacific, Vol122 pp.103, 2010
H. Sugai(Kyoto Univ), et al.
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.