Difference between revisions of "Map-making"
| Line 19: | Line 19: | ||
== Map validation == | == Map validation == | ||
| − | [[ | + | [[Category:Data processing]] |
Revision as of 09:42, 21 September 2012
Introduction[edit]
Flux calibration[edit]
Noise properties[edit]
Zodi correction[edit]
Zodiacal Emission is removed from the 353, 545 and 857 GHz channels. It is described in ?????, but a synopsis of the procedure is as follows:
- During each survey, a large fraction of the sky has observations which all fall within a week of each other. That is, during a single survey, most pixels are observed during a short, well-defined period. The contribution from Zodiacal Emission to the total brightness seen, then, is well defined.
- We use the the COBE model of the Zodiacal Light to make predictions for this emission.
- We fit the survey difference maps with these model templates to estimate the emissivity of each component at the Planck wavelengths.
- We reconstruct the full mission using the combination of the COBE geometric model with the emissivities determined above.
- We remove the reconstruction above from each ring of data.
- We then make maps as described in section ?????
Map validation[edit]
[LFI meaning]: absolute calibration refers to the 0th order calibration for each channel, 1 single number, while the relative calibration refers to the component of the calibration that varies pointing period by pointing period.
