IntroductionThe Infrared Camera and Spectrograph (IRCS) can be installed at the Infrared Nasmyth focus of Subaru Telescope and incorporates two 10242 ALADDIN III arrays which are sensitive from 0.9-5.6 um. IRCS has been designed to deliver diffraction limited images from 2-5 um, as well as providing spectroscopy with grisms and a cross-dispersed echelle. The camera can also be used as a slit viewer for the echelle spectroscopy.
ImagingThe imaging mode of IRCS provides two plate scales, of 20 and 52 mas per pixel, producing fields of view of 21'' and 54'', respectively. The 20 mas scale is designed to be used with the Adaptive Optics system, while the 52 mas scale is suitable for general-purpose imaging. The camera is equipped with a range of broad and narrow-band filters in its three filter wheels.
Grism spectroscopyThe camera section of IRCS also has grisms (providing spectral resolutions R = 100-2000).
Echelle spectroscopyIRCS also has a cross-dispersed echelle (providing spectral resolution up to 20 000). The highest spectral resolutions can only be obtained with very narrow (0.14'') slits, which are not recommended without Adaptive Optics. From S12B semester, we open a NH3 qas absorption cell that enables the measurement a high-precision radial velocities at the 30 m s-1 level even with the spectral resolving power of IRCS (R = 20,000). The NH3 gas cell can be used in a part of K-band with IRCS + AO188 mode only. If you have any question, please contact to IRCS + AO188 support astronomer. The IR gas cell was provided by Andreas Seifahrt (University of Chicago) in collaboration with colleagues at the university of Goettingen (Germany) and Lund Observatory (Sweden).
Questions regarding IRCS should be directed to Tae-Soo Pyo. Please note that all numbers on these pages are subject to change as the performance of IRCS is better determined.
28 July 2009