Difference: PacsCalibrationWeb (161 vs. 162)

Revision 1622017-05-31 - KatrinaExter

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META TOPICPARENT name="WebHome"

PACS instrument and calibration web pages

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  For any user of PACS data, it is necessary to have some information about the AOT -- the observing mode -- of the observation they are working on in order to know which of the SPG products to work with, which pipelines to use, and which calibration or other uncertainties to consider. All the relevant AOT details are held in the header keywords of the FITS files. Every FITS file in an HSA download has a complete copy of the keywords, and hence any Level >=2 product can be opened (e.g. in fv) to find the AOT. Tables containing the description of the AOT keywords can be found in the PACS Products Explained.
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For photometry, almost all observations were of the scan-map mode and hence the same set of three maps are provided, where the key to knowing which to use is in the final chapter of the PACS Products Explained. For spectroscopy there were may more variations on the AOT: pointing mode, spectral mode, background sampling, type of mapping. In addition, the Level 2 and 2.5 products for spectroscopy are "sliced": each cube or table is for one wavelength range only, and the filenames differ only by an "s##" where more than one wavelength range was requested for that observation. This is also explained in the PACS Products Explained. In order to make it easier for an archive user to know, before having to open any FITS file, which FITS file they want, we have created a spreadsheet of AOT keyword data. In this table, you will find: the obsid; line/range spectroscopy; chop-nod or unchopped; pointed or mapping; if mapping, the raster details; the number of spectral lines or ranges requested or "sedxxx" to indicate that the observation is a full SED in the xxx band; line IDs given by the observer; and then four columns of slice number (the "s##" in the filename) and wavelength range: two columns (red and blue camera) for pointed observations where the search was done on the rebinned cube (one of the final products for this mode), and two columns (red and blue) for mapping observations where the search was done on the projected cubes (one of the final products for this mode).
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For photometry, almost all observations were of the scan-map mode and hence the same set of three maps are provided, where the key to knowing which to use is in the final chapter of the PACS Products Explained. For spectroscopy there were may more variations on the AOT: pointing mode, spectral mode, background sampling, type of mapping. In addition, the Level 2 and 2.5 products for spectroscopy are "sliced": each cube or table is for one wavelength range only, and the filenames differ only by an "s##" where more than one wavelength range was requested for that observation. This is also explained in the PACS Products Explained. In order to make it easier for an archive user to know, before having to open any FITS file, which FITS file they want, we have created a spreadsheet of AOT keyword data. In this tarball (spreadsheet/readme), you will find: the obsid; line/range spectroscopy; chop-nod or unchopped; pointed or mapping; if mapping, the raster details; the number of spectral lines or ranges requested or "sedxxx" to indicate that the observation is a full SED in the xxx band; line IDs given by the observer; and then four columns of slice number (the "s##" in the filename) and wavelength range: two columns (red and blue camera) for pointed observations where the search was done on the rebinned cube (one of the final products for this mode), and two columns (red and blue) for mapping observations where the search was done on the projected cubes (one of the final products for this mode).
  All standard observations that processed to at least Level 2 in the SPG pipeline are included in this table.
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META FILEATTACHMENT attachment="AOTMetaDataSpec.csv" attr="" comment="AOT related meta data for spec observations" date="1487335117" name="AOTMetaDataSpec.csv" path="AOTMetaDataSpec.csv" size="959304" user="KatrinaExter" version="1"
META FILEATTACHMENT attachment="pacs_specLP15.pdf" attr="" comment="" date="1492679738" name="pacs_specLP15.pdf" path="pacs_specLP15.pdf" size="227346" user="KatrinaExter" version="1"
META FILEATTACHMENT attachment="pacs_photLP15.pdf" attr="" comment="" date="1492679738" name="pacs_photLP15.pdf" path="pacs_photLP15.pdf" size="116679" user="KatrinaExter" version="1"
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META FILEATTACHMENT attachment="AOTMetaData.tar" attr="" comment="" date="1496230263" name="AOTMetaData.tar" path="AOTMetaData.tar" size="997888" user="KatrinaExter" version="1"
 
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