VIMOS: Reference Frames

VIMOS reference frames

Calibrations are taken for IMG, MOS, and IFU settings, according to the VIMOS calibration plan.

 

Reference frames:

Detector frames

IMG frames

MOS frames

IFU frames

Standard VIMOS-IFU Calibration Frames (always with binning 1x1)

Note: The examples reported here are referring to calibrations taken with all the supported settings. With HR and MR grisms the IFU shutter is always ON (only the central part of the IFU head is receiving light). Whith LR grisms the IFU shutter is, in the standard configuration, OFF (all the IFU head is receiving light), but also the shutter ON mode is supported.

When the IFU shutter is OFF each quadrant receives 4 bundles of fibers and when the shutter is ON each quadrant receives 1 boundle. Each boundel is made up of 400 fibers, as is apparent by looking at the cross-cuts on the flat field example images.

In the bluest settings, the counts level may be quite low (as low as 5,000 ADU). Counts much below this limit should be flagged, as they could indicate problems with the calibration units.

LR_blue and HR_blue arc lamp frames should have He and Ne lines, LR_red and MR(+GG475) frames should have He and Ar lines only, MR+OS-blue, HR_red and HR_orange frames should have He, Ne and Ar lines.

Resolution	LR_blue	LR_red	MR	HR_blue	HR_red	HR_orange
Flat field
HeArNe arc lamp