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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, Angel Lopez-Sanchez (alopez -@- aao.gov.au).
- News
- Release of the "IRIS2 Observing Guide" (link to PDF file) (19 December 2012)
- The Lehuakona (Antares) Starlink Release (20 February 2009)
- New IRIS2 Instrument Scientist (23 March 2007)
- IRIS2 Web page and S/N Calculator Updates (1 December 2006)
- Transformations to Other Photometric Systems Derived (18 October 2006)
- Mark 2 Science-grade Detector Commissioned (June 2, 2006)
- IRIS2 Engineering Detector back on-sky (June 20, 2005)
- IRIS2 Detector Failure (June 3, 2005)
- IRIS2 ORAC-DR Improvements (March 1, 2005)
- New IRIS2 Spectroscopy Data Reduction Recipes for ORAC-DR (Jan 30, 2004)
- IRIS2 Officially Dedicated (February 21, 2003)
- IRIS2 Wins Prestigious Engineering Awards (November 23, 2002)
- IRIS2 Multi-object Spectroscopy - First Results (August 26, 2002)
- Pipeline Reduction of IRIS2 Data with ORAC-DR (August 8, 2002)
- IRIS2: An Overview
- Optical Design
- Cryogenics and Dewars
- Wheels
- Filters
- Spectroscopic Formats
- Detector
- Image Scale and Orientation
- Slit Orientation
- Guiding
- Imaging Sensitivity & Imaging Exposure Time Calculator
- Imaging Overheads
- Spectroscopic Sensitivity & Spectroscopic Exposure Time Calculator
- Spectroscopic Overheads
- Multi-object spectroscopy
- The IRIS2 Observing Guide
- Operating IRIS2
- Observing Sequences
- Imaging Observations with IRIS2
- Imaging Strategies
- Photometric standards
- Transforms to Other Photometric Systems
- Dome flats: Broad-band filters
- Dome flats: Narrow-band filters
- Spectroscopic Observations with IRIS2
- Wavelength Formats
- Acquisition
- Spectroscopic flatfielding
- Wavelength Calibration
- Smooth spectrum (Atmospheric / Telluric) Standard stars
- Spectrophotometric standards
- Sequences
- Sky subtraction
- Straightening spectra
- Object Extraction
- Multi-Object Spectroscopy
- Data Processing with ORAC-DR
- New Starlink Release
- New-and-improved recipes available for download
- Why ORAC-DR?
- How to start up and run ORAC-DR
- What do all those filenames mean?
- Using your own recipes and primitives
- Flux calibration
- Troubleshooting
- IRIS2 Filter Information
- Flexure, Focus, & Astrometric Distortion
- Flexure
- Slit Positioning
- Camera Focus - Sensitivity to Camera Defocus
- Camera Focus - Imaging
- Camera Focus - Spectroscopy
- Astrometric Distortion
- Detector Linearity & Correction
- IRIS2 Software
- IRIS2 Software System Overview in Word, PDF, or HTML format.
- Skycat
- Portable Telescope Control System (PTCS)
- The SPECTRO task.
- IRIS2 Benchmarks
- IRIS2 Technical Information
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These pages contain information on the functionality of the IRIS2 Infrared Imager and Spectrograph. Pages maintained by Angel Lopez-Sanchez (alopez -@- aao.gov.au) and Stuart Ryder (sdr -@- aao.gov.au). Page last modified by Angel Lopez-Sanchez.