Difference between revisions of "Summary LFI"
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{{DISPLAYTITLE:Summary of LFI data characteristics}} | {{DISPLAYTITLE:Summary of LFI data characteristics}} | ||
− | Quantification of the performance of LFI is summarized in Table 1 below. All the details can be found in the LFI data processing paper {{PlanckPapers|planck2014-a03 | + | Quantification of the performance of LFI is summarized in Table 1 below. All the details can be found in the LFI data processing paper {{PlanckPapers|planck2014-a03}}. |
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<sup>a</sup> Determined by fitting Jupiter observations directly in the timelines. | <sup>a</sup> Determined by fitting Jupiter observations directly in the timelines. | ||
− | <sup>b</sup> Calculated from the main beam solid angle of the effective beam, Ω<sub>eff</sub> = mean(Ω). These values are used in the source extraction pipeline ({{PlanckPapers|planck2014-a35 | + | <sup>b</sup> Calculated from the main beam solid angle of the effective beam, Ω<sub>eff</sub> = mean(Ω). These values are used in the source extraction pipeline ({{PlanckPapers|planck2014-a35}}). |
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<sup>d</sup> Values derived from fitting noise spectra. | <sup>d</sup> Values derived from fitting noise spectra. | ||
− | <sup>e</sup> Sum of the error on the estimation of the calibration constant (0.25 %) and the square root of the squared sum of the following errors: beam uncertainty; sidelobe convolution effect; and unknown systematics as measured from the power spectrum at 50 < ℓ < 250, see {{PlanckPapers|planck2014-a05 | + | <sup>e</sup> Sum of the error on the estimation of the calibration constant (0.25 %) and the square root of the squared sum of the following errors: beam uncertainty; sidelobe convolution effect; and unknown systematics as measured from the power spectrum at 50 < ℓ < 250, see {{PlanckPapers|planck2014-a05}}. |
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− | <sup>f</sup> Peak-to-peak difference between 99% and 1% quantities in the pixel value distributions from simulated maps, see {{PlanckPapers|planck2014-a03 | + | <sup>f</sup> Peak-to-peak difference between 99% and 1% quantities in the pixel value distributions from simulated maps, see {{PlanckPapers|planck2014-a03}}. |
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Revision as of 10:11, 26 September 2016
Quantification of the performance of LFI is summarized in Table 1 below. All the details can be found in the LFI data processing paper Planck-2015-A02^{[1]}.
Parameter | 30 GHz | 44 GHz | 70 GHz |
---|---|---|---|
Centre frequency [GHz] | 28.4 | 44.1 | 70.4 |
Scanning beam FWHM^{a} [arcmin] | 33.10 | 27.94 | 13.08 |
Scanning beam ellipticity^{a} | 1.37 | 1.25 | 1.27 |
Effective beam FWHM^{b} [arcmin] | 32.29 | 27.00 | 13.21 |
White noise level in map^{c} [μK_{CMB}] | *TBD | *TBD | *TBD |
White noise level in timelines^{d} [μK_{CMB} s^{1/2}] | 148.1 | 174.2 | 152.0 |
f_{knee}^{d} [mHz] | 114.1 | 52.4 | 19.7 |
1/f slope^{d} | -0.92 | -0.88 | -1.20 |
Overall calibration uncertainty^{e} [%] | 0.35 | 0.26 | 0.29 |
Systematic effects uncertainty in Stokes I ^{f} [μK_{CMB}] | 0.88 | 1.97 | 1.87 |
Systematic effects uncertainty in Stokes Q ^{f} [μK_{CMB}] | 1.11 | 1.14 | 2.25 |
Systematic effects uncertainty in Stokes U ^{f} [μK_{CMB}] | 0.95 | 1.29 | 2.22 |
^{a} Determined by fitting Jupiter observations directly in the timelines.
^{b} Calculated from the main beam solid angle of the effective beam, Ω_{eff} = mean(Ω). These values are used in the source extraction pipeline (Planck-2015-A26^{[2]}).
^{c} White noise per pixel computed from half-ring difference maps. These values are within 1% of the white noise sensitivity computed directly on the timelines, taking into account the actual integration time represented in the maps.
^{d} Values derived from fitting noise spectra.
^{e} Sum of the error on the estimation of the calibration constant (0.25 %) and the square root of the squared sum of the following errors: beam uncertainty; sidelobe convolution effect; and unknown systematics as measured from the power spectrum at 50 < ℓ < 250, see Planck-2015-A04^{[3]}.
^{f} Peak-to-peak difference between 99% and 1% quantities in the pixel value distributions from simulated maps, see Planck-2015-A02^{[1]}.
References[edit]
- ↑ ^{1.0}^{1.1} Planck 2015 results. II. LFI processing, Planck Collaboration, 2016, A&A, 594, A2.
- ↑ Planck 2015 results. XXVI. The second Planck catalogue of compact sources, Planck Collaboration, 2016, A&A, 594, A26.
- ↑ Planck 2015 results. IV. LFI beams and window functions, Planck Collaboration, 2016, A&A, 594, A4.
(Planck) Low Frequency Instrument
Full-Width-at-Half-Maximum
Cosmic Microwave background
To be defined / determined