AAT Instrument
| In Brief: | UCLES is a cross-dispersed Echelle spectrograph located at
the coudé
focus offering high resolution combined with good wavelength coverage. CYCLOPS is a cassegrain fibre-feed for UCLES being offered on a shared-risks basis in Semester 2011A. It is expected to be the default feed for most applications using the 79 l/mm echelle. Prospective users should consult the CYCLOPS status page and CYCLOPS web page at UNSW for more information and discuss their needs with the UCLES Instrument Scientist before planning to use it. |
|---|---|
| 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. | |
Heath Jones, AAT Technical Secretary, aatts -@- aao.gov.au