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Ultra High Resolution Facility (UHRF)

AAT Instrument


In Brief: UHRF is an Echelle spectrograph located at the coudé focus. It offers ultra high resolution over very small spectral regions. An image slicer is used. Focal reducing lenses are available to provide lower resolutions. 

Note that the CYCLOPS fibre-feed being offered for UCLES can not be used for UHRF.
Instrument Scientist: Gayandhi de Silva
See Instrument Scientist page for contact details.
Manual: AAO UM-25.3 "The UCL Coudé Echelle Spectrographs", Stathakis et al, 2000. 
Other Info:

For recently updated information see the UHRF Cookbook

A service programme is available for projects requiring <6 hrs.

Fact Sheet:


Detector: EEV2 2kx4k 13.5um square pixels, usually binned x 8.
The EEV suffers from fringing in the red, but the MITLL3 is not ideal for most programs as it doesn't support on-chip binning.
Focal Station: Mounted at Coudé focus with f/36 top end.
Image Slicer: 1.5×1.5 arcsec entrance, but not fully transmitted. Throughput depends on seeing and telescope pointing. 
Spectral Resolution*: R=300 000 (0.3M), 600 000 (0.6M) or 940 000 (1.0M mode)
Wavelength Coverage: 1.0M: 4Å (@3000Å) - 13Å (@11000Å)
0.6M: 6Å (@3000Å) - 22Å (@11000Å)
0.3M: 13Å (@3000Å) - 45Å (@11000Å)
Gratings: 31.6 lines/mm echelle plus range of cross-dispersing gratings.
Sensitivities: Approximate sensitivities for UHRF+EEV: B=3.0 at 4232Å, V=3.3 at 5890Å and I=2.4 at 7700Å give 100 electrons/sec per 0.01Å in 1.8" seeing. For more info see the manual.
*Spectral Resolution R measured as &lambda/&delta&lambda, where &delta&lambda = FWHM unresolved line, usually 2 pixels.

Heath Jones, aatts -@- aao.gov.au