4.2. PACS calibration products

4.2.1. PACS Common Calibration Products

Product type   Description
PacsCalCommon   PACS Common Calibration Context
ChopperAngle   Relation between the digital field plate readout and physical angle of the chopper mirror with respect to the PACS focal plane unit.
ChopperAngleRedundant   Relation between the digital field plate readout and physical angle of the redundant chopper mirror with respect to the PACS focal plane unit.
ChopperSkyAngle   Conversion factor for chopper physical deflection angle with respect to the focal plane unit to angle on the sky.
ChopperJitterThreshold   Thresholds in arcmins for the required position accuracy of the final chopper positions for the science and calibration window. This product is used to determine if detector signals are on a stable chopper plateau.
CsResistanceTemperature   Temperature - Resistance conversion table for the internal calibration
FilterWheel2Band   Conversion of filter wheel position to photometer or spectrometer band seen by the detectors.
ObcpDescription   Contains human-readable descriptions of the on-board control procedure on-board numbering scheme.
Siam   Spacecraft-instrument alignment matrices for the different PACS virtual apertures.
TimeDependency   Defines time dependency for calibration products.

4.2.2. PACS Photometer Calibration products

Product type   Description
PacsCalPhot   PACS Photometer Calibration Context
Absorption   Transmission as a function of wavelength for the entire photometer chain system
ArrayInstrument   Photometer detector array to Instrument alignment.
BadPixelMask   Bad pixels mask for the photometer.
CalSources   Flux per pixel from the Calibration Sources in the blue and red channel.
ClSaturationLimits   CL saturation limits.
ClTransferFunction   SurfCal_20061120 calibration VRL-VH_BLIND for saturation limits computation.
CorrZeroLevel   Zero-level of the bolometer arrays.
CrosstalkMatrix   Crosstalk matrices for the red and blue photometer.
DetectorSortMatrix   Mapping PACS SPU-internal detector number to pixel coordinate in the PACS focal-plane.
DiffCS   Calibration Source 1-Calibration Source 2 used as reference.
FilterTransmission   Measured filter transmission profiles for the different bandpass and order selection filters in the PACS spectrometer and photometer chain.
FlatField   Pixel-to-pixel response variation for the PACS bolometer arrays.
Gain   Digits to Volts conversion of the bolometer signals.
Invntt   Inverse noise to noise correlation for MadMap.
InvnttBL   Blue Long band inverse noise to noise correlation for MadMap.
InvnttBS   Blue Short band inverse noise to noise correlation for MadMap.
InvnttRED   RED band inverse noise to noise correlation for MadMap.
Masks   PACS blue and red channel bad pixel map.
NoisePerPixel   Noise for each pixel to populate the starting values in the noise cube.
PhotometricStabilityThreshold   Thresholds used to raised an alert on bad photometric stability.
Responsivity   Responsivity for bolometer.
SatLimits   Saturation limits for the bolometer arrays.
SubArrayArray   Alignment of the different photometer sub-matrices with respect to the entire detector array.
TimeDependency   Defines time dependency for calibration products.

4.2.3. PACS Spectrometer Calibration Products

Product type   Description
PacsCalSpec   PACS Spectrometer Calibration Context
AbsoluteCapacitance   Contains the measured capacitances for the red and blue array.
ArrayInstrument   Array to Instrument coordinate conversion
BadPixelMask   Bad pixels mask for PACS spectrometer.
CalSourceFlux   Contains the fluxes in Jy of both calibration sources.
CapacitanceRatios   Contains the capacitance ratios for the red and the blue array
ChopperThrowDescription   Defines the chopper position readout versus a verbal description.
CrosstalkMatrix   Crosstalk matrices for the red and blue spectrometer arrays.
DarkCurrent   Dark current [V/s] for PACS spectrometer blue and red arrays.
DetectorSortMatrix   Mapping PACS Signal Processing Unit-internal detector number to pixel coordinate in the PACS focal-plane.
DiscardRampHooks   Specifies the number of readouts to discard at the start of each photoconductor integration ramp.
EffectiveCapacitance   The effective capacitance of the 4 possible commandable capacitances of the spectrometer detector integrating readout circuits.
FilterBandConversion   Defines the wheel position readout to band conversion
GprHall   Grating position versus Hall sensors readback. This conversion is used in the degraded operating mode of the grating, in case of contingent functioning of the inductosyn position readout.
GprHallRedundant   Defines the redundant grating position versus Hall sensors readback.
GratingJitterThreshold   Thresholds in position readouts for the required accuracy of a stable grating position. These are used to determine the start and end of long grating slews.
KeyWavelengths   Lists the key wavelength intervals - these are wavelength ranges at which the internal calibration sources are visited inside the AOT, as well as sky calibration sources during dedicated absolute flux calibration measurements. The absolute flux of every PACS spectrum is tied to external flux calibrators via observations at these wavelengths.
LabelDescription   The status of PACS mechanisms and detector readout timing is sampled at the detector readout frequency and encoded in a label. This calibration table contains the definition of this encoding.
LittrowParameters   Parameters for the littrow equation describing the PACS grating position to wavelength calibration. The present version assumes the same calibration for all spatial pixels; in future versions this calibration will be available for every spatial pixel.
LittrowPolynomes   Grating wavelength calibration: Littrow equation parameters/polynome approximation for alpha per pixel
ModuleArray   Module to Array coordinate conversion calibration object
NoisyPixelMask   Noisy pixels mask for PACS spectrometer.
NominalResponse   Contains the nominal responses in V/s/Jy per prime key wavelength.
NonLinearity   Contains coefficient of second order polynomial to linearise signals for the red and blue array
Psf   Point spread function of the spectrometer.
RampModel   Fixed parameters of the IMEC institute analytical model for the spectrometer integrating ramps.
RampSatLimits   Signal saturation limits (voltage/digits) for the red and blue channel.
Readouts2Volts   Digits to Volts conversion for the spectrometer readout values.
RelCalSourceFlux   Contains the flux ratios of both calibration sources at key wavelengths to prime key wavelengths.
RsrfB2A   Relative Spectral Response Function - wavelength-dependent response per pixel for band B2A
RsrfB2B   Relative Spectral Response Function - wavelength-dependent response per pixel for band B2B
RsrfB3A   Relative Spectral Response Function - wavelength-dependent response per pixel for band B3A
RsrfR1   Relative Spectral Response Function - wavelength-dependent response per pixel for band R1
Sensitivity   Contains the line and continuum RMS noise fluctuations for 1 second integration time
SignalSatLimits   Saturation limits of the spectrometer detector arrays
SpecProperties   Spectrometer constants to calculate spectral resolution vs. wavelength
TelescopeBackground   SED of the telescope background
TimeDependency   Defines time dependency for calibration products.
wavelengthGrid   PACS spectrometer wavelength grid for the three grating orders and for different upsamples