Planck 2013 results. V. LFI calibration | Astronomy & Astrophysics (A&A)

Planck 2013 results

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Table 8

Accuracy in the calibration of LFI data.

Type of uncertainty	Applies to	30 GHz	44 GHz	70 GHz

Absolute
Standard^a .............	All sky	0.25%	0.25%	0.25%
Zero level [ μK_CMB] .............	All sky	−300.84 ± 2.23	−22.83 ± 0.78	−28.09 ± 0.64
Beam uncertainty .............	All sky	0.5%	0.1%	0.3%
Sidelobe convolution effect .............	All sky	0.2%	0.2%	0.2%
Colour corrections .............	Galactic areas	\|α − 2\| 0.1%	\|α − 2\| 0.3%	\|α − 2\| 0.2%
Relative
Statistical/algorithmical errors^b [ μK_CMB pixel^-1] .............	All sky	4.3	4.7	6.5
Known systematics^c .............	All sky	0.1%	0.1%	0.1%
Unknown systematics^d [ μK_CMB pixel^-1] .............	CMB areas	<8.8	<5.2	<9.5
	Galactic region	< 17.0	< 9.8	< 13.1
Unknown systematics^e (50 <ℓ < 250) .............	All sky	0.2%	0.2%	0.1%
Total
CMB areas^f [ μK_CMB pixel^-1] .............		< 8.5	< 7.1	< 8.2
Galactic region^f [ μK_CMB pixel^-1] .............		< 38.5	< 13.7	< 16.8
Sum of absolute and relative errors^g .............	All sky	0.82%	0.55%	0.62%

Notes.

^(a)

Error on the estimation of the calibration constant K_dip (Eq. (27)).

^(b)

Peak-to-peak differences, as reported in Planck Collaboration III (2014).

^(c)

Error in the estimation of the calibration constant K.

^(d)

Scaled rms of the value of pixels in odd-odd survey half-difference maps minus the rms due to statistical noise. We used here N_side = 128 for 30 and 44 GHz, and N_side = 256 for 70 GHz.

^(e)

Estimated from inter-channel comparisons on the cross-spectra.

^(f)

Scaled rms of the value of pixels in odd-even survey half-difference maps minus the rms due to statistical noise. As above, we used here N_side = 128 for 30 and 44 GHz, and N_side = 256 for 70 GHz.

^(g)

Sum of the error from the standard uncertainty and the square root of the squared sum of the following errors: (1) beam uncertainty; (2) sidelobe convolution effect; and (3) unknown systematics (as measured from the power spectrum at 50 <ℓ < 250).

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