Science Field of View

Notes

• The orientation of this view is as seen in the DSIMULATOR program for DEIMOS slitmask design. This is rotated 180° from the DEIMOS ds9 image display.
• The solid yellow line denotes the outline of the metal slitmask area.
• The shaded area at top right is vignetted. Slits should not be placed here.
• The shaded area at top left is outside the legal slit are (being too close to the mask edge). Slits should not be placed here.
• The dashed yellow lines indicate gaps in the CCD mosaic. Spectra from slits placed between these pairs of lines may not fall on the detector.
• The solid red line indicates the outline of the DEIMOS guider field of view. The area above the dotted line is visible as a reflection off the slitmask (when a mask is in place). The area below the dotted line is visible on the fixed pickoff mirror.

Guider Field of View

• The orientation of this view is as seen in the DEIMOS MAGIQ display and is identical to the orientation of the image above.
• The bottom 1/3 of the field of view looks at the sky image reflected off of the fixed pickoff mirror.
• The upper 2/3 of the field of view looks at the sky image reflected off of the slitmask. This about 30% as sensitive as the pickoff mirror.