Quality Control: WAVE frames

SINFONI Quality Control:
wavelength calibration

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general information | parameters trended


QC PLOTS
WAVELENGTH:	CURRENT	HISTORY
wavelength
resolving power
X-position of slitlet #17
FWHM of arc lines
number of detected arc lines

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.

top General Information

Arc lamp frames are used to create and monitor the SINFONI wavelength solutions and are routinely obtained on a daily basis. Each arc lamp is exposed in pairs made up of lamp-on and lamp-off frames and are made for each of the available gratings (J, H, K, and H+K) and pixel scales (25, 100, and 250 mas). They are processed into a number of product frames

A stacked SINFONI wavelength calibration arc lamp. The 32 slitlets are evident in this image.

The pipeline-derived wavelength solution applied to the above arc lamp frame results in this resampled WAVE image. This product is solely created for quality control and is used to check the quality of the global dispersion solution.

top WAVE parameters trended

QC1 plots

The QC1 plots for the SINFONI WAVE show the:

wavelength for the J, H, K, and H+K gratings and the 25, 100, and 250 mas pixel scales (in microns)
spectral resolution for the J, H, K, and H+K gratings (250 mas pixel scale only)
X-axis position of the center of the 17th slitlet (in pixels)
full width half-maximum of the identified arc lines (in pixels)
number of identified arc lines

The first two panels of the WAVE QC1 plots. These are the most important parameters for SINFONI wavelength health.

These panels show the wavelength for each of the four gratings (J, H, K, and H+K) (vertical axis) at three pixel scales (horizontal axis).

These panels show the spectral resolution for each of the four gratings (J, H, K, and H+K) at a single pixel scale (250 mas).

QC1 parameters trended

Page	Parameter	Table: Name (QC1 database)	Description of Procedure
1	wavelength	sinfoni_wave: qc.coef0.med	SINFONI pipeline: Based on the position of 15 (J-band) to 28 (H-band) arc lines a third-order wavelength solution is computed. This wavelength dispersion solution is computed for each of the 2048 columns and qc.coef0.med is the median shift over all columns.
2	spectral resolution	sinfoni_wave: qc.fwhm.med & qc.coef1.med	SINFONI pipeline: The resolving power is computed from the FWHM of the identified arc lines divided by the central wavelength.
3	X position of slitlet #17	sinfoni_wave: qc.slit17.x	SINFONI pipeline: One of the products is the SLIT_POS table containing the computed left and right edges of each of the slitlets. The parameter trended here is just the mid value of a slitlet near the detector center.
4	FWHM of arc lines	sinfoni_wave: qc.fwhm.med	SINFONI pipeline: The FWHM of the identified arc lines.
5	number of identified arc lines	sinfoni_wave: qc.wave.all	SINFONI pipeline: The number of identified arc lines.

Trending and Issues

The wavelength dispersion solution derived by the SINFONI pipeline and trended is intended for determining the instrument stability. It is a relatively low-order dispersion solution is based solely on a few detected arc lines. Users processing science data should use higher orders and include sky OH emission lines for higher accuracy dispersion solutions.

History

SINFONI grating wavelengths and resolutions are quite stable. The wavelength rms values are generally better than 2 Angstroem (worst case: 4 Angstroem in H+K) over entire observing semesters. Any slightly larger jumps are only seen following interventions. This can be seen in the full wavelength history and the full resolution history.