Difference: HipeWhatsNew10x (33 vs. 34)

Revision 342012-12-10 - BrunoAltieri

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Calibration

Photometry

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  • There is no change in the PACS photometer calibration since Hipe 9 and version 9 of the calibration tree.
 

Spectroscopy

  • In order to be less sensitive to (on average) mispointed flux calibration observations, the flux calibration scheme has changed: the construction of the calibration tables is now based on the standard calibrators fluxes coming from the central 9 spaxels instead of the central one only. This implies that two new calibration tables were introduced in the calibration tree, namely observedResponse3x3 and calSourceFlux3x3. Those tables are used by default in specDiffCs and should lead to more reliable fluxes, notably in case of mispointed observations. An optional parameter, use3x3 (True by default), was added to specDiffCs. You can still use the former calibration scheme by setting use3x3 to False although it is not recommended.
  • As a result of the new calibration scheme, the absolute fluxes found at level 2 are slightly reduced.
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Product changes

Photometry

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  • From SPG10 onwards, level 2 maps are processed with a very small high-pass filter width to filter as much the 1/f noise and get optimal sensitivity to point-sources. Half-widths of 15 and 25 readouts are used in the blue and red channel respectively. As a consequence extended emission at virtually all scales is filtered out. The level 2.5 maps processed with MADmap should be used to get extended emission, which is preserved at all scales in the MADmap maps. Note that SPG10 bulk pipeline processing will only start in early 2013.

  • Error maps in SPG10 level2 maps are produced by the task photCoverage2Noise, where error maps are derived from the coverage map and include cross-correlation noise.
 

Spectroscopy

Documentation

 
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