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Australian Human Resources Institute Diversity Awards 2013 Finalist

InfraRed Imaging Spectrograph (IRIS)

AAT Instrument - IRIS is a decommissioned instrument and is no longer offered or supported at the AAT. The following information is provided for historical completeness.

In Brief: IRIS provides imaging and spectroscopic modes over 0.9 - 2.5 microns. Imaging polarimetry and spectropolarimetry modes are also available. Chopping secondary f/36 top end of f/15 top end can be used.
Instrument Scientist: No Instrument Scientist at present. Contact Head of Astronomy for information.
Manual: AAO UM-30a "IRIS Users' Guide" Allen, D.A., 1993 (considerably out-of-date)
Other Info: There is an entry in the Observing Guide.

Fact Sheet:


Detector: 128 x 128 HgCd Te array detector with 60 micron square pixels.
Focal Station: Mounted at Cassegrain focus with either f/15 or f/36 top end.
Image Scale: 1.94 and 0.60 arcsec/pixel at f/15
0.79 and 0.24 arcsec/pixel at f/36
Spectral Resolution*: R=300 with long slit spectroscopy at f/15 at H or K (1"x60" slit) or f/36 (0.4"x25" slit).
R=400 with 1.5×1.5 arcsec slit at f/36 covering 0.9-1.4 microns or 1.5-2.5 microns.
Filters: Broad band J, H, K, K', Kn
Intermediate band (R~25) centred at 2.21, 2.34 microns
Narrow band (R~100) Br gamma, H2 2.122 microns
Polarimetry: imaging polarimetry available at 0.60 and 0.24 arcsec/pixel. Spectropolarimetry available at f/15 (R=300 H, K)
Sensitivities: Photometry at f/36, 0.79 arcsec/pixel, 5 sigma in 2"x2" aperture after 1 min at J=1.8.5, H=18.3, K=16.8, K'=17.4, Kn=17.4
Spectroscopy at f/36; 3 sigma in 1000s for J=17, H=16, K=15.05 magnitude deeper at f/15
*Spectral Resolution R measured as lambda/delta_lambda, delta_lambda = FWHM unresolved line, usually 2 pixels.