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The AAO Infrared Imager & Spectrograph
The images above show the Orion Nebula as imaged by IRIS2 in the H2 v=1-0 molecular line during commissioning in October 2001, and IRIS2 itself mounted at the Cassegrain focus of the 3.92-m Anglo-Australian Telescope.
The IRIS2 infrared imager and spectrograph was built in-house by the AAO, and commissioned between October 2001 and July 2002. It provides the AAO with an infrared facility for
  • Wide field imaging (~8'x8')
  • Moderate resolution (R=2400) long-slit spectroscopy, and
  • Moderate resolution (R=2400) multi-object spectroscopy.

At its heart is a 1024x1024 Rockwell HAWAII-1 HgCdTe infrared detector, illuminated by a f/8 to f/2.2 focal reducer. Spectroscopy is achieved by the implementation of a slit wheel allowing the insertion of a 1" wide slit (or multi-slit masks), and a wheel in the collimated beam containing grisms. These grisms use ~50mm 45-degree prisms of sapphire to deviate the beam and feed replica transmission gratings applied to their surfaces.

The spatial scale of IRIS2 is 0.4486"/pixel, giving a field of view of 7'.7 x 7'.7. The 1" slit for spectroscopy projects to 2.2 pixels on the detector, providing a resolution R~2400.

Papers making use of data from IRIS2 should refer to the IRIS2 technical description by Tinney et al. (2004, Proc. SPIE, 5492, 998); a preprint is available.

If you have any queries about the status or use of IRIS2, please do not hesitate to contact the Instrument Scientist, Chris Lidman (clidman -@- aao.gov.au).

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These pages contain information on the functionality of the IRIS2 Infrared Imager and Spectrograph. Pages maintained by Chris Lidman (clidman -@- aao.gov.au). Page last modified by Chris Lidman.