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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 σΩ [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 νIν = 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 νIν spectrum.

(e3)

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

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