| Abstract: | We describe the processing of the 334 billion raw data samples from the High
Frequency Instrument (hereafter HFI) which we performed to produce six
temperature maps from the first 295 days of Planck-HFI survey data. These maps
provide an accurate rendition of the sky emission at 100, 143, 217, 353, 545
and 857GHz with an angular resolution ranging from 9.9 to 4.4 arcmin. The white
noise level is around 1.5 microK.degree or less in the 3 main CMB channels
(100-217GHz). The photometric accuracy is better than 2% at frequencies lower
or equal to 353GHz, and around 7% at the two highest frequencies. The maps
created by the HFI Data Processing Centre reach our goals in terms of
sensitivity, resolution, and photometric accuracy. They are already
sufficiently accurate and well-characterised to allow scientific analyses which
are presented in an accompanying series of early papers. At this stage, HFI
data appears to be of high quality and we expect that with further refinements
of the data processing we should be able to achieve, or exceed, the science
goals of the project. |
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