Community Release Note for PACS Calibration Set v41

PACS calibration file set v41 incorporates the following differences from the previous community release, v32:

Photometer

• Updated four calibration products after verifying the new PACS photometer flux calibration: Responsivity, ApertureCorrection, FlatField, and NonLinearCoeff.

Spectrometer

• New calibration files for pointing correction based on Neptune rasters: Spectrometer Beams and OffRatio.
• New BeamSize calibration product. This calibration product holds a list of wavelengths and corresponding observed FWHMs of the beam, based on a Neptune raster. We will use this calibration product f.i. to determine the optimal pixel size for the Wcs used in the drizzling algorithm.
• New OffRatio calibration product. It contains the ratios of the chopper on/off signal ratios of dark sky calibration measurements. This is used for the pointing correction in the task SpecRespCalToBackgroundTask which determines the flux in Jy on Frames level by using the telescope background.
• New PointSourceLoss calibration product v3 (Format version 2.0). In addition to the two already existing ArrayDatasets "wavelength" and "fraction", which respectively contain the wavelengths and the corresponding fractions of the flux in the central spatial pixel with respect to the total flux, three new ArrayDatasets named "fractionCentral_to_3x3", "fraction3x3_to_total" and "fraction5x5_to_total" are added. The first ArrayDataset contains the flux fraction in the central spatial pixel with respect to the flux within the central 3x3 spatial pixels and the two next ArrayDatasets contain the flux fraction within the central 3x3 and the 5x5 spatial pixels with respect to the total flux.
• Added the spectrometer Beams and OffRatio for band B3A. This is done by copying the data from B2A and converting the grating positions.
• Cooler Recycling Times updated until OD 945.

Affected observations & processing

Updated calibration products

The following calibration products have been updated:

• PCalSpectrometer_BeamsR1_FM_v1.fits
• PCalSpectrometer_BeamsB2A_FM_v1.fits
• PCalSpectrometer_BeamsB2B_FM_v1.fits
• PCalSpectrometer_BeamSize_FM_v1.fits
• PCalSpectrometer_OffRatioR1_FM_v2.fits
• PCalSpectrometer_OffRatioB2B_FM_v2.fits
• PCalSpectrometer_OffRatioB2A_FM_v2.fits
• PCalSpectrometer_PointSourceLoss_FM_v3.fits
• PCalSpectrometer_BeamsB3A_FM_v1.fits
• PCalSpectrometer_OffRatioB3A_FM_v1.fits
• PCalPhotometer_CoolerRecyclingTimes_FM_v7.fits
• PCalPhotometer_ApertureCorrection_FM_v3.fits
• PCalPhotometer_FlatField_FM_v4.fits
• PCalPhotometer_NonLinearCoef_FM_v2.fits
• PCalPhotometer_Responsivity_FM_v7.fits

Release Date