UHRF Proposals

Images Slicer:

UHRF uses an image slicer of 1.5×1.5 arcsec entrance, but not fully transmitted. Throughput depends on seeing and telescope pointing. 

Signal to Noise Estimates:

Approximate sensitivities for UHRF using the EEV CCD is such that at 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. 

Gratings and Resolution modes:

UHRF used a 31.6 lines/mm echelle grating plus a range of cross-dispersing gratings to achieve high resolution. The various available resolution modes are:

R=300 000 (0.3M)

R=600 000 (0.6M)

R=940 000 (1.0M)

Wavelength coverage:

1.0M: 4Å (@3000Å) - 13Å (@11000Å) 

0.6M: 6Å (@3000Å) - 22Å (@11000Å) 

0.3M: 13Å (@3000Å) - 45Å (@11000Å)

Detectors:

The same detectors as for UCLES are available for UHRF. The EEV2 2kx4k 13.5um pixels is used, 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.

1. Blue sensitive E2V 2K x 4K (13.5 micro pixels)

Image scale: 0.16 arcsec per spatial pixel

On chip binning in both spatial and spectral direction is possible.

2. Red sensitive MITLL3 2K x 4K (15 micro pixels)

Image scale: 0.18 arcsec per spatial pixel

No binning possible.