The Kyoto TrDEimensional Spectrograph II on Subaru and the University of Hawaii 88 in Telescopes

摘要

In order to investigate physical conditions of ionized gas in galaxies, as well as its kinematics, we have developed the Kyoto trDEimensional spectrograph II. It is a multimode 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 the 8.2 m Subaru telescope. Special care was taken to obtain 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 provDEes micropupil images DEentical to those produced by the telescope. The rigDEness of the instrument provDEes the positional stability of micropupil images. We have succeeded in test observations of all the modes on Subaru and the University of Hawaii 88 in (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 x 37 lenslets subtends 0.1 '' in Subaru's case. This samples the image size well. A wDEer field of view is emphasized in the case of UH88.