Difference: PacsCalibrationWeb (124 vs. 125)

Revision 1252015-12-09 - KatrinaExter

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META TOPICPARENT name="WebHome"

PACS instrument and calibration web pages

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  You can also consult the PACS NHSC homepage.
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Important message about drizzled cubes in HIPE 13

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Important message about drizzled cubes

 
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Due to an oversight in the pipeline scripts of HIPE 13, the drizzled cubes you get for chop-nod line scan observations created by "SPG 13" will have incorrect fluxes. Therefore you should not use the drizzled cubes downloaded from the HSA if the Meta datum "creator" is "SPG 13.0", whether they are within the ObservationContext at Level 2, or part of a Standalone Browse Product download. Any drizzled cubes created for unchopped mode observations will be unaffected. For chop-nod range scan observations, drizzled cubes are not created by the SPG 13 pipeline anyway. This oversight will be corrected in HIPE/SPG 14.
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Due to an oversight in the pipeline scripts of HIPE 13, the drizzled cubes for chop-nod line scan observations created by "SPG 13" have incorrect fluxes. Therefore you should not use the drizzled cubes downloaded from the HSA if the Meta datum "creator" is "SPG 13.0", whether they are within the ObservationContext at Level 2, or part of a Standalone Browse Product download.
 
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For the affected observations you have the following alternatives:
  • Use the projected cubes instead, which you will also find within the ObservationContext at Level 2, but which are not part of the Standalone Browse Product download for the affected observations.
  • Run one of the interactive pipeline scripts to create the drizzled cubes yourself. Contact the Herschel Helpdesk first to ask for an updated pipeline script to do this, since the interactive pipeline scripts in HIPE 13 (and 12) also contain the mistake.
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Drizzled cubes created for unchopped mode observations are unaffected, and for chop-nod range scan observations, drizzled cubes are not created by the SPG 13 pipeline.
 
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For Your Information: Drizzled cubes FITS files, and their name as listed in an ObservationContext, are: HPS3DD [R|B] (red and blue) Standalone browse product drizzled cube FITS files, and their name as listed in an ObservationContext in the browse product section are: HPS3DEQ [R|B] (red and blue, equidistant wavelength grid version of the drizzled cubes). Projected cubes have the name: HPS3DP [R|B].
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This oversight has been corrected in HIPE/SPG 14. The drizzled cubes you get in an observation downloaded from the HSA with "creator" of "SPG 14.0" have correct fluxes. In HIPE 14 there is a dedicated script to produce these drizzled cubes. Therefore we recommend you use the SPG 14.0 products, or use the dedicated pipeline in HIPE 14 if you need your drizzled cubes before the SPG 14 products are available.
 
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For more information about the standard and the standalone browse cubes provided for PACS spectroscopy, see the PACS Products Explained HIPE help document (which is also linked as a PDF file in the Data Reduction section).
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FYI: Drizzled cubes can be found in an observation in the context called HPS3DD [R|B] (red and blue). They are also provided as standalone browse products in a context called HPS3DEQ [R|B] (red and blue, equidistant wavelength grid version of the drizzled cubes). On disk the FITS files for these cubes have the same set of letters in their name (but in lower case) and are at the Level 2 part of an observation.
 
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Important message about Unimap maps in HIPE 13

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For more information about the standard and the standalone browse cubes provided for PACS spectroscopy, see the PACS Products Explained HIPE help document, which is also available from the PACS documentation webpage and the HIPE download webpage, both off the Herschel Science Centre webpage.

Important message about Unimap maps

 
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Some Unimap maps show overshooting effects around very bright sources that are surrounded by a diffuse and relatively faint background. See, as an example, the blue image of NGC253 (obsID: 1342221743). This effect is due to a not optimised convergence of the GLS algorithm and it will be corrected in HIPE/SPG14.
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Some Unimap maps produced by SPG 13 and using HIPE 13 scripts show overshooting effects around very bright sources that are surrounded by a diffuse and relatively faint background. See, as an example, the blue image of NGC253 (obsID: 1342221743). This effect is due to a non-optimised convergence of the GLS algorithm and it will be corrected in HIPE/SPG14.
 
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This has been corrected in HIPE 14, and products with "creator" of "SPG 14" have no overshooting effects.
 

Observing with PACS

  • The PACS Observer's Manual HTML PDF (11 Mb), version 2.3, 8-June-2011 : the first thing to read before applying for time with PACS (or even before working on PACS data for the first time), as it tells you how the instrument works. This includes:
    • A description of the layout and the components of the PACS photometer and spectrometer
 
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