- Gemini Office
Royal Greenwich Observatory (RGO) Spectrograph
AAT Instrument. RGO is a decommissioned instrument and is no longer offered or supported at the AAT. The following information is provided for historical completeness.
|In Brief||The RGO Spectrograph is a general purpose optical spectrograph, covering 3100-11000Å. The 25cm camera can be used for long-slit spectroscopy, time series observations and spectropolarimetry. The 82cm camera has been superseded by UCLES for most applications, but is useful when small spatial pixels are needed (e.g. spectroastrometry).|
|Instrument Scientist||No Instrument Scientist at present. Contact Head of Astronomy for information.|
|Manual||AAO UM-2.4 "The RGO Spectrograph Manual" by R. A. Stathakis and H. M. Johnston, 2002.
"The Medium Dispersion Cu Ar Arc Atlas" by C. G. Tinney, 1995, available online as a gzip'd Postscript file. Other (hardcopy only) related manuals are; AAO UM-24.2 "Spectropolarimetry at the AAT" by J. Hough & J. Bailey, 1994; and AAO UM 4 and 4a, Arc Atlases for CuAr and FeAr.
|Other Info||Information on the different gratings is available.
Wavelength centres and coverage for grating settings can be calculated using the RGOANG spectrograph facility.
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|Dectector||Portable CCD, usually the 2k x 4k EEV or MITLL CCDs.|
|Focal Station||Mounted at the Cassegrain focus with f/8 top end.|
|Image Scale||0.43 arcsec per pixel with 25cm + EEV (unbinned)|
|Spectral Resolution||A range of gratings offer R=850 (250B) to R=12 000 (1200l, 2nd order) at 6000Å with 1.7 arcsec slit.|
|Filters||A range of neutral density and order sorting filters are available.|
|*Spectral Resolution R measured as lambda/delta_lambda, delta_lambda = FWHM unresolved line, usually 2 pixels.|
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