IRCS
Introduction
The 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. Two papers describing IRCS are available:- The Infrared Camera and Spectrograph for the Subaru Telescope by Tokunaga et al. (900kb PDF)
- IRCS: Infrared Camera and Spectrograph for the Subaru Telescope by Kobayashi et al. (2Mb gzipped postscript).
Imaging
The 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.- Available filters and sensitivities
- Guide to exposure times
- Image anomalies
- Coronagraph Masks(holes): 0."8, 0."6, 0."15 in diameter
- Imaging Exposure Time Calculator
- OTC (Overhead and Total observing time Calculator) for Imaging mode
- Bad pixel file for Camera Side (2011.06.20) (ascii format: cam_badpix.coo) (pixel list format: cam_badpix.pl]
Grism spectroscopy
The camera section of IRCS also has grisms (providing spectral resolutions R = 100-2000).- Grism settings and sensitivities
- System efficiency and transmission curves
- Guide to exposure times
- SPICA, the Spectroscopic Integration Calculator Applet
- Reflective Slits for Grism/Prism : Refl3W(0."9, 0."45,0."6) at 52mas, Refl3W(0."45) at 20mas, Refl4 (0."3,0."15,0."1,0."23) at 52mas, Refl4(0."15,0."1,0."23) at 20mas
- OTC (Overhead and Total observing time Calculator) for Grism/Prism Spectroscopy mode
Echelle spectroscopy
IRCS 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).- Echelle configurations and sensitivities
- Wavelength coverage of the echelle orders
- Sample images and response functions [PDF (9Mb)][HTML]
- Echelle Simulator v 1.0 for IRCS [README][Package]
- Guide to exposure times
- Echelle ETC (Exposure Time Calculator)
- OTC (Overhead and Total observing time Calculator) for Echelle Spectroscopy mode.
- Bad pixel file for Echelle Side (2009.07.28) (spg_badpix.coo) [Image: spg_badpix.jpg]
![[Image: spg_badpix.jpg]](echelle/spg_badpix.jpg){kind=link}
Further information
- L'-band background variation since 2004: [vs DATE] [vs Wavelength]
- Current Filters, Slits, Grisms/Prism, etc
Preparing Observation
- Preparation for OPE(Observation Procedure Execution) file
- Template for OPE file (Template.ope)
- Template for Calibration OPE file (CAL_Temp2010.ope)
- IRCS Observation Log Sheets [IRCS only] [IRCS+AO188 for (all mode) (Image only) (Grism only) (Echelle only) ]
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