Index for Researchers
Information for S17B
IRCS provides several linear polarimetry modes in 0.95 - 2.5 Ám since S15B as 'Shared-Risk' mode.
Users who want to propose polarimetry observation SHOULD contact to Dr. Tamura (motohide.tamura_at_nao.ac.jp; the PI of the waveplate unit) and Tae-Soo Pyo (pyo_at_naoj.org) in advance before the submission of their proposals.
Please see "Polarimetry" section for more detailed information about new polarimetry mode.
IRCS provides Grism and Echelle spectroscopy for open use service program since 16B. Please refer Call for Proposals for more information.
The Infrared Camera and Spectrograph (IRCS) can be installed at
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
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.
IRCS is always operated with AO188 attached regarldess of using adaptive optics,
and relies on AO188 for guiding without a separate autoguider.
Two papers describing IRCS are available:
When referring to IRCS in a paper, please use the following citation.
The imaging mode of IRCS provides two
scales, of 20 and 52 mas per pixel, producing fields of view of 21''
54'', respectively. The 20 mas scale is designed to be used with the Adaptive
Optics system, while the 52 mas scale is suitable for
imaging. The camera is equipped with a range of broad and narrow-band
in its three filter wheels.
The camera section of IRCS also has grisms
(providing spectral resolutions
R = 100-2000).
Grism settings and sensitivities
System efficiency and
Guide to exposure times
SPICA, the Spectroscopic
- 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
IRCS also has a cross-dispersed echelle
(providing spectral resolution up to 20 000). The highest spectral
can only be obtained with very narrow (0.14'') slits, which are not
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).
Polarimetry IRCS provides several linear polarimetry modes in 0.95 - 2.5 Ám since
S15B as 'Shared-Risk' mode. Imaging polarimetry is available for Y-,
J-, H-, and K(K')-bands. Spectropolarimetry is available with zJH- and
HK-grims in 52 mas mode only. Please be advised that circular polarimetry is not available.
Users should contact to Dr. Tamura (monohide.tamura_at_nao.ac.jp)
and Tae-Soo Pyo (pyo_at_naoj.org) for more detailed information if they have any plan of the polarimetry mode observation.
Questions regarding IRCS should be directed to Ji Hoon Kim (). Please note that
all numbers on these pages are subject to change
as the performance of IRCS is better determined.
6 February 2017