Table 4:

Summary of Planck instrument performance in flight, as predicted from ground characterisation (Mennella et al. 2010; Lamarre et al. 2010)

Instrument

LFI HFI
Center frequency [GHz] 30 44 70 100 143 217 353 545 857
Number of polarised detectorsa 4 6 12 8 8 8 8    
Number of unpolarised detectors         4 4 4 4 4
Meanb FWHM (arcmin) 32.7 29.5 13.0 9.6 7.0 4.6 4.5 4.7 4.3
Meanc ellipticity 1.36 1.50 1.27 1.17 1.05 1.11 1.13 1.03 1.04
Bandwidth ($\Delta\nu$, GHz) 4.5 4.1 12 32 45 68 104 174 258
${\Delta T/T}$ per pixel (Stokes I)d 3.3 5.2 8.9 3 2.2 4.8 2.0 150 6000
${\Delta T/T}$ per pixel (Stokes Q &U)e 4.6 7.4 12.7 4.8 4.1 9 38    
Point source sensitivityf (1$\sigma$, mJy) 22 59 46 14 10 14 38 44 45

Notes. (a) For the LFI, the values shown correspond to the output of a linearly polarised differential radiometer; two such outputs, referred to as ``detectors'' in this paper, are supported by each horn. In fact each of the two radiometer outputs from one horn is built from the data acquired by two diodes, each of which are switched at high frequency between the sky and a blackbody load at 4 K (see Bersanelli et al. 2010). For the HFI, a (polarised) detector is taken to be the output of one of a pair of linearly polarised polarisation-sensitive bolometers; each horn contains one pair, i.e. two orthogonally-polarised detectors. Unpolarised spider-web bolometers are present in some of the horns, in these cases there is only one detector per horn. See Lamarre et al. (2010).
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(b) Band-averaged, including polarised and unpolarised detectors, see Tauber et al. (2010).
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(c) Band-averaged, including polarised and unpolarised detectors, see Tauber et al. (2010).
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(d) In $\mu $K/K (thermodynamic temperature) for 15 months integration, $1\sigma$, for square pixels whose sides are given in the row ``Mean FWHM''. The instantaneous sensitivities used for these estimates are drawn from ground calibration, averaged for all detectors in each channel; for LFI the sensitivity is the mean of the two methods described in Mennella et al. (2010).
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(e)  $\sqrt{2}\times{\Delta T/T}(I)$.
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(f) Not including background confusion. Estimates of confusion levels can be extracted from Leach et al. (2008).


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