Planck Pre-Launch Status Papers - APC - Université Paris Diderot ...

A&A 520, A8 (2010)Table 3. Band-averaged cross-polar leakage η and effective rotation δmeasured for the flight model OMTs.Feed Side arm Main arm Difference aη s δ s η m δ m ¯η ¯δLFI- 10 −3 ◦ 10 −3 ◦ 10 −3 ◦18 0.39 0.02 0.29 0.97 0.41 0.4919 0.46 0.44 0.40 −1.53 0.73 −0.5420 0.10 0.27 0.18 −0.89 0.25 −0.2622 0.26 0.54 0.36 −1.46 0.61 −0.4623 0.34 0.76 0.34 −1.41 0.70 −0.3324 0.03 0.01 0.02 −0.37 0.04 −0.1825 0.18 −0.02 0.07 −0.75 0.16 −0.3926 0.42 0.95 0.34 0.83 0.38 0.8927 0.02 −0.02 0.02 0.40 0.03 0.1928 0.04 0.16 0.06 0.26 0.05 0.21Notes. Values are weighted by the measured bandpass and the differentialCMB spectrum. (a) effective ¯η and ¯δ evaluated by integrating overthe difference bandpasses, M QS = W s (ν)/G s −W m (ν)/G m .dust emission), in both cases assuming that the gain calibrationwas determined from the CMB dipole as discussed in Sect. 5.2.We found the spectral dependence of η and δ to be negligible,