VIMOS Quality Control: IFU calibration

VIMOS Quality Control:
IFU calibration

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wavelength calibration | stability


QC PLOTS
	CURRENT	HISTORY
resolution
dispersion rms
QC1 database (advanced users): browse \| plot
central fibre
lost fibres
fibre trace slope
QC1 database (advanced users): browse \| plot
Click on CURRENT to see the current trending (Health Check). Click on HISTORY to see the historical evolution of the trending.

IFU calibrations come, for each quadrant, as a series of flat-field exposures (through the fibre system) plus one arc lamp exposure.

top Wavelength calibration

QC1 parameters

parameter	QC1 database: table, name	procedure
resolution	vimos_ifu_wave, resol1 vimos_ifu_wave, resol2 vimos_ifu_wave, resol3	R = lambda/delta lambda. The spectral resolution is computed for each grism using three selected arc lamp lines with wavelengths close to the center, close to the red, and close to the blue end of the spectrum. The resolution is given by the average on all slits of the ratio between the selected arc lamp line wavelength and its FWHM (Gauss fit)
dispersion rms	vimos_ifu_wave, ids_rms	rms of the inverse dispersion solution residuals in pixels. The residuals are the differences between the expected line positions and the actual line positions after applying the dispersion solution

History

date	event
2010-07	tilt of focal plane vs. detector plane, upper part of quadrant 4 is out of focus
2011-05	tilt of focal plane is fixed

top IFU stability

All IFU stability parameters are measured for each quadrant and for each pseudo slit separately. For LR grisms, all four pseudo slits are used. For MR and HR grisms, only the central pseudo slit (number 2) is used.

QC1 parameters

parameter	QC1 database: table, name	procedure
central fibre	vimos_ifu_trace, trace1_central vimos_ifu_trace, trace2_central vimos_ifu_trace, trace3_central vimos_ifu_trace, trace4_central	This is the sequence number of the active fibre closest to the central CCD X pixel (1024) at the reference CCD Y pixel. The reference Y pixels are selected depending on grism and quadrant.
number of lost fibres	vimos_ifu_trace, num_lost1 vimos_ifu_trace, num_lost2 vimos_ifu_trace, num_lost3 vimos_ifu_trace, num_lost4	The number of fibres that could not be successfully traced on the IFU flats.
fibre slope	vimos_ifu_trace, trace1_slope vimos_ifu_trace, trace2_slope vimos_ifu_trace, trace3_slope vimos_ifu_trace, trace4_slope	This is the slope of a reference fibre trace on the detector along a 400 pixel long Y interval. The original pipeline parameter has been multiplied with 4096. This gives the difference between the X positions of the fibre trace at the bottom and the top of the detector.