AAT Instrument
| In Brief: | UCLES is a cross-dispersed Echelle spectrograph located at
the coudé
focus offering high resolution combined with good wavelength coverage. CYCLOPS2 is a cassegrain fibre-feed for UCLES. It is expected to be the default feed for most applications using the 79 l/mm echelle longwards of 4000A. Prospective users should consult the CYCLOPS2 status page and CYCLOPS2 web page at UNSW for more information. |
|---|---|
| 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: |
UCLES ThAr Atlas with the MITLL and EEV CCDs, Ryder, 2001. AAO Precision Velocity Instrument for UCLES - Iodine Cell For recently updated information see the UCLES Cookbook A service programme is available for projects requiring <6 hrs. |
| Detector: | Blue-sensitive EEV2 2K×4K (13.5 micron pixels) or red-sensitive MITLL3 2K×4K (15 micron pixels). |
| Focal Station: | Mounted at Coudé with f/36 top end. |
| Image Scale: | 0.16 arcsec per spatial pixel with EEV2 and 0.18 arcsec per spatial pixel with MITLL3. All measurements taken without the focal modifier. |
| Spectral Resolution*: | R = >100 000 possible with the EEV2, and <80 000 with the MITLL3. Note however that a 1 arcsec slit yields R~45,000. |
| Gratings: | 31.6 lines/mm gives almost continuous wavelength coverage at
bluer wavelengths, with short slit length (6-15 arcsec).
79 lines/mm gives 2.5 times longer slit, but less complete wavelength coverage. Both gratings produce almost identical dispersion and resolution. |
| Sensitivities: | See the Signal-to-Noise Calculator. |
| *Spectral Resolution R measured as &lambda/&delta&lambda, where &delta&lambda = FWHM unresolved line, usually 2 pixels. | |
Gayandhi De Silva, AAT Technical Secretary, aatts -@- aao.gov.au