Difference: PacsCalibrationWeb (151 vs. 152)

Revision 1522017-01-11 - KatrinaExter

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META TOPICPARENT name="WebHome"

PACS instrument and calibration web pages

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  • SPG 14.2.2 products will soon run. This will be the final bulk processing of PACS data, however only a subset of PACS spectroscopy observations need to be processed with 14.2.2 to correct errors in the previous processing:
    • the Level 2.5 for all unchopped range scans: previously the Level 2.5 were created incorrectly
    • the Level 3 for all chop-nod pointed range scans: this is being done to have a correct "ObservationSummary" included in the observation dataset, however the data themselves will be no different as the has not changed
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    • a few isolated spectroscopy observations (1342247513, 1342246558,1342225987, 1342225145, 1342225789, 1342247790)
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    • a few spectroscopy observations (1342247513, 1342246558,1342225987, 1342225145, 1342225789, 1342247790)
 
  • HIPE 15 will soon be released. There are almost no differences in the data reduction software compared to HIPE 14.2:
    • for the spectroscopy interactive pipeline scripts, one task has been added which changes the values of two meta data: centreRaDecMetaData, which sets the "ra" and "dec" meta data to the centre of the cube's field for each cube created, independently; it does not change the data or coordinates of the cubes.
Changed:
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    • the calibration file dealing with the EEFs (encircled energy fractions, for photometry) has an additional set of entries
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    • new aperture corrections have been added to the calibration tree (photometry), for the prime and parallel modes at the 20 and 60 arcsec/s speeds; the difference in the corrections are very small
    • additional documentation has been added to the PDRG for photometry on extracting uncertainties from scan maps (chp. 4)
    • the PACS Products Explained includes information about which files to grab directly from HSA tarball downloads (rather than via HIPE), and has a new short chapter on recommendations for different science cases
 
  • The forward modelling tool (FMT). This tool is to be used with PACS spectroscopy observations of objects which are extended but not flat over the observed field. It is to be used to estimate the correction to the fluxes necessary to account for the uneven illumination of the FoV by the PACS integral field unit (i.e. the gaps between the spaxels). See the Data Reduction section for more information.

Observing with PACS

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FMT (forward modelling tool).
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NEW FMT (forward modelling tool).
 Some information about this is provided in the spectroscopy PACS Data Reduction Guide. A quick summary is:
  • the FoV of the PACS integral field unit is not uniformly illuminated, which leads to some loss of light between the spaxels
  • for point sources and flat sources this does not matter -- the corrections applied by the pipeline (the point source corrections in extractCentralSpectrum, for example, and the extended source correction applied to all observations by the pipeline) account for this
 
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