Planck early results. III. First assessment of the Low Frequency Instrument in-flight performance

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Table 8

LFI beam FWHM and mean ellipticity measured in flight from the first Jupiter pass.

	FWHM^a	Uncertainty^b
RCA	[′]	[′]	Ellipticity^c

70 GHz average .............	13.01		1.27
LFI18 ...........................	13.39	0.170
LFI19 ...........................	13.01	0.174
LFI20 ...........................	12.75	0.170
LFI21 ...........................	12.74	0.156
LFI22 ...........................	12.87	0.164
LFI23 ...........................	13.27	0.171
44 GHz average .............	27.92		1.26
LFI24 ...........................	22.98	0.652
LFI25 ...........................	30.46	1.075
LFI26 ...........................	30.31	1.131
30 GHz average .............	32.65		1.38
LFI27 ...........................	32.65	1.266
LFI28 ...........................	32.66	1.287

Notes.

^(a)

The square root of the product of the major axis and minor axis FWHMs of the individual RCA beams, averaged between M and S radiometers;

^(b)

the standard deviation of the mean of the 1σ statistical uncertainties of the fit. Although a small difference between the M and S beams caused by optics and receiver non-idealities can be expected, for the purpose of point-source extraction relevant for this paper the beams are considered identical, as this effect is well within the statistical uncertainty;

^(c)

ratio of the major and minor axes of the fitted elliptical Gaussian.

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