Planck 2013 results. VI. High Frequency Instrument data processing

Planck 2013 results

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Table 4

HFI nominal maps − main characteristics.

Quantity							Notes

Reference frequency ν [GHz] ................	100	143	217	353	545	857	^a1
Number of bolometers .....................	8	11	12	12	3	4	^a2

Effective beam solid angle Ω [arcmin²] .......	105.78	59.95	28.45	26.71	26.53	24.24	^b1
Error in solid angle σ_Ω [arcmin²] ...........	0.55	0.08	0.03	0.02	0.03	0.03	^b2
Spatial variation (rms) ΔΩ [arcmin²] .........	0.31	0.25	0.27	0.25	0.34	0.19	^b3
Effective beam FWHM₁ [arcmin] ...........	9.66	7.27	5.01	4.86	4.84	4.63	^b4
Effective beam FWHM₂ [arcmin] ...........	9.65	7.25	4.99	4.82	4.68	4.33	^b5
Effective beam ellipticity ϵ ................	1.186	1.036	1.177	1.147	1.161	1.393	^b6
Variation (rms) of the ellipticity Δϵ ..........	0.023	0.009	0.030	0.028	0.036	0.076	^b7

Sensitivity per beam solid angle [μK] ........	10	6	12	39			^c1
[kJy sr^-1] .....					13	14	^c1
Sensitivity [μK deg] ....................	1.8	0.8	1.0	3.5			^c2
[kJy sr^-1 deg] ...............					1.1	1.1	^c2

Relative calibration accuracy [%] ..........	≲ 0.2	−	≲ 0.2	≲ 1	≲ 5	≲ 5	^d1
Absolute calibration accuracy [%] ..........	≲ 0.5	≲ 0.5	≲ 0.5	≲ 1.2	≲ 10	≲ 10	^d2

Galactic zero-level offset [MJy sr^-1] ..........	0.0047	0.0136	0.0384	0.0885	0.1065	0.1470	^e1
Galactic zero-level uncertainty [MJy sr^-1] ......	0.0008	0.0010	0.0024	0.0067	0.0165	0.0147	^e2
CIB monopole prediction [MJy sr^-1] .........	0.0030	0.0079	0.033	0.13	0.35	0.64	^e3

Notes.

^(a1)

Channel map reference frequency, and channel identifier.

^(a2)

Number of bolometers whose data was used in producing the channel map.

^(b1)

Mean value over detectors at the same frequency. See Sect. 5.

^(b2)

As given by simulations.

^(b3)

Variation (rms) of the solid angle across the sky.

^(b4)

FWHM of the Gaussian whose solid angle is equivalent to that of the effective beams.

^(b5)

FWHM of the mean best-fit Gaussian.

^(b6)

Ratio of the major to minor axis of the best-fit Gaussian averaged over the full sky.

^(b7)

Variability (rms) on the sky.

^(c1)

Estimate of the noise per beam solid angle given in b1. See Sect. 6.3.

^(c2)

Estimate of the noise scaled to 1° assuming that the noise is white.

^(d1)

Relative calibration accuracy between frequency channels. See Sect. 6.

^(d2)

Calibration uncertainty including the estimated uncertainty of the calibrating source.

^(e1)

Offset to remove at each frequency to set the Galactic zero level. The values quoted correspond to νI_ν = const. At the four lowest frequencies, the conversion factor is about 244, 371, 483, and 287 MJy sr^-1 K.

^(e2)

Overall error on the map zero point, for a constant νI_ν spectrum.

^(e3)

According to the Béthermin et al. (2012) model, whose uncertainty is estimated to be at the 20% level. (Also for constant νI_ν.)

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