UIST is a 1-5um imager-spectrometer with a 1024x1024 InSb array.
The instrument is designed to switch quickly and accurately between imaging and
spectroscopic modes; spectroscopic targets are acquired by first imaging the field.
mechanical layout shows the instrument's key features.
imaging mode there are two plate scales available, 0.12 arcsec per pixel
or 0.06 arcsec per pixel, giving fields of view of 2x2 or 1x1 arcminute;
subarray readout is possible. In
spectroscopy mode only the 0.12"/pixel camera
is used, though there is a choice of slit widths, and slitless spectroscopy is
Integral field spectroscopy
is available via an image slicing design which provides spectroscopy of a
3.3x6.0 arcsec (rotatable) area sampled every 0.48x0.24 arcsec.
Polarimetry is also available with all imaging and long-slit
spectroscopy modes. Finally,
coronagraphic imaging and
coronagraphic imaging polarimetry
is also now possible. (The Fabry-Perot interferometer for the K window is
not offered with UIST but is available with
UIST was built at the ATC in Edinburgh. Suzie Ramsay Howat was the
project scientist. The instrument was delivered to Hawaii in August
2002, commissioned in October 2002 and has been available for
observing since December 2002.
UIST enquiries should be addressed to the instrument scientist
An appropriate reference for UIST would be:
Ramsay Howat S.K. et al. (11 authors), 2004,
"The commissioning of and first results from the UIST imager spectrometer",
In Proc Spie 5492, UV and Gamma-Ray Space Telescope Systems, eds. Hasinger G,
Turner M.J., p.1160
UKIRT would also welcome an
in papers resulting from UIST observations.
Imaging with UIST (including coronagraphic imaging)
Spectroscopy with UIST
The Integral Field Unit (IFU)
Polarimetry with UIST
Sample files with different instrument settings