Difference between revisions of "Summary LFI"

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{{DISPLAYTITLE:Summary of LFI data characteristics}}
 
{{DISPLAYTITLE:Summary of LFI data characteristics}}
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The LFI performance are summarized in Table 1 below. All the details can be found in the LFI data processing paper {{PlanckPapers|planck2014-a03||Planck-2015-A03}}.
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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}}.
 
<!-- {{PlanckPapers|planck2013-p02}} -->
 
<!-- {{PlanckPapers|planck2013-p02}} -->
  
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!scope="col"| 70 GHz
 
!scope="col"| 70 GHz
 
|-
 
|-
−
|width="320" | Center frequency [GHz]
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|width="320" | Centre frequency [GHz]
 
|width="100" | 28.4
 
|width="100" | 28.4
 
|width="100" | 44.1
 
|width="100" | 44.1
 
|width="100" | 70.4  
 
|width="100" | 70.4  
 
|-
 
|-
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|width="320" | Scanning beam FWHM<math>^{\rm a}</math> [arcmin]
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|width="320" | Scanning beam FWHM<sup>a</sup> [arcmin]
 
|width="100" | 33.10
 
|width="100" | 33.10
 
|width="100" | 27.94
 
|width="100" | 27.94
 
|width="100" | 13.08
 
|width="100" | 13.08
 
|-
 
|-
−
|width="320" | Scanning beam ellipticity<math>^{\rm a}</math>
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|width="320" | Scanning beam ellipticity<sup>a</sup>
 
|width="100" | 1.37
 
|width="100" | 1.37
 
|width="100" | 1.25
 
|width="100" | 1.25
 
|width="100" | 1.27
 
|width="100" | 1.27
 
|-
 
|-
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|width="320" | Effective beam FWHM<math>^{\rm b}</math> [arcmin]
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|width="320" | Effective beam FWHM<sup>b</sup> [arcmin]
 
|width="100" | 32.29
 
|width="100" | 32.29
 
|width="100" | 27.00
 
|width="100" | 27.00
 
|width="100" | 13.21
 
|width="100" | 13.21
 
|-
 
|-
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|width="320" | White noise level in map<math>^{\rm c}</math> [<math>\mu</math>K<math>_{CMB}</math>]
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|width="320" | White noise level in map<sup>c</sup> [&mu;K<sub>CMB</sub>]
 
|width="100" | *TBD
 
|width="100" | *TBD
 
|width="100" | *TBD
 
|width="100" | *TBD
 
|width="100" | *TBD
 
|width="100" | *TBD
 
|-
 
|-
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|width="320" | White noise level in timelines<math>^{\rm d}</math> [<math>\mu</math>K<math>_{CMB} \;s^{1/2}</math>]
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|width="320" | White noise level in timelines<sup>d</sup> [&mu;K<sub>CMB</sub> s<sup>1/2</sup>]
 
|width="100" | 148.1
 
|width="100" | 148.1
 
|width="100" | 174.2
 
|width="100" | 174.2
 
|width="100" | 152.0
 
|width="100" | 152.0
 
|-
 
|-
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|width="320" | f<math>_{\rm knee}^{\rm d}</math> [mHz]
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|width="320" | <i>f</i><sub>knee</sub><sup>d</sup> [mHz]
 
|width="100" | 114.1
 
|width="100" | 114.1
 
|width="100" | 52.4
 
|width="100" | 52.4
 
|width="100" | 19.7
 
|width="100" | 19.7
 
|-
 
|-
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|width="320" | 1/<math>f</math> slope<math>^{\rm d}</math>
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|width="320" | 1/<i>f</i> slope<sup>d</sup>
 
|width="100" | -0.92
 
|width="100" | -0.92
 
|width="100" | -0.88
 
|width="100" | -0.88
 
|width="100" | -1.20
 
|width="100" | -1.20
 
|-
 
|-
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|width="320" | Overall calibration uncertainty<math>^{\rm e}</math> [%]
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|width="320" | Overall calibration uncertainty<sup>e</sup> [%]
 
|width="100" | 0.35
 
|width="100" | 0.35
 
|width="100" | 0.26
 
|width="100" | 0.26
 
|width="100" | 0.29
 
|width="100" | 0.29
 
|-
 
|-
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|width="320" | Systematic effects uncertainty in Stokes <math>I^{\rm f}</math> [<math>\mu</math>K<math>_{CMB}</math>]
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|width="320" | Systematic effects uncertainty in Stokes <i>I</i> <sup>f</sup> [&mu;K<sub>CMB</sub>]
 
|width="100" | 0.88
 
|width="100" | 0.88
 
|width="100" | 1.97
 
|width="100" | 1.97
 
|width="100" | 1.87
 
|width="100" | 1.87
 
|-
 
|-
−
|width="320" | Systematic effects uncertainty in Stokes <math>Q^{\rm f}</math> [<math>\mu</math>K<math>_{CMB}</math>]
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|width="320" | Systematic effects uncertainty in Stokes <i>Q</i> <sup>f</sup> [&mu;K<sub>CMB</sub>]
 
|width="100" | 1.11
 
|width="100" | 1.11
 
|width="100" | 1.14
 
|width="100" | 1.14
 
|width="100" | 2.25
 
|width="100" | 2.25
 
|-
 
|-
−
|width="320" | Systematic effects uncertainty in Stokes <math>U^{\rm f}</math> [<math>\mu</math>K<math>_{CMB}</math>]
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|width="320" | Systematic effects uncertainty in Stokes <i>U</i> <sup>f</sup> [&mu;K<sub>CMB</sub>]
 
|width="100" | 0.95
 
|width="100" | 0.95
 
|width="100" | 1.29
 
|width="100" | 1.29
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|}
  
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<math>^{\rm a}</math> Determined by fitting Jupiter observations directly in the timelines.
+
<sup>a</sup> Determined by fitting Jupiter observations directly in the timelines.
  
−
<math>^{\rm b}</math> Calculated from the main beam solid angle of the effective beam, <math>\Omega_{\rm eff} = \hbox{mean}(\Omega)</math>. These values are used in the source extraction pipeline {{PlanckPapers|planck2014-a35||Planck-2015-A35}}.  
+
<sup>b</sup> Calculated from the main beam solid angle of the effective beam, &Omega;<sub>eff</sub> = mean(&Omega;). These values are used in the source extraction pipeline ({{PlanckPapers|planck2014-a35||Planck-2015-A35}}).  
 
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<!-- {{PlanckPapers|planck2013-p05}} -->  
  
 +
<sup>c</sup> 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.
  
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<math>^{\rm c}</math> 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.
+
<sup>d</sup> Values derived from fitting noise spectra.  
  
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<math>^{\rm d}</math> 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 < &#8467; < 250, see {{PlanckPapers|planck2014-a05}}.
−
 
 
−
<math>^{\rm e}</math> 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 <math>50 < \ell < 250 </math>, see {{PlanckPapers|planck2014-a05||Planck-2015-A05}}.
 
 
<!-- {{PlanckPapers|planck2013-p02b}} -->
 
<!-- {{PlanckPapers|planck2013-p02b}} -->
  
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<math>^{\rm f}</math> Peak-to-peak difference between 99% and 1% quantities in the pixel value distributions from simulated maps, see {{PlanckPapers|planck2014-a03||Planck-2015-A03}}.
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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}}.
 
<!-- {{PlanckPapers|planck2013-p02a}} -->
 
<!-- {{PlanckPapers|planck2013-p02a}} -->
  

Latest revision as of 10:09, 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].


Table 1. LFI performance parameters
Parameter 30 GHz 44 GHz 70 GHz
Centre frequency [GHz] 28.4 44.1 70.4
Scanning beam FWHMa [arcmin] 33.10 27.94 13.08
Scanning beam ellipticitya 1.37 1.25 1.27
Effective beam FWHMb [arcmin] 32.29 27.00 13.21
White noise level in mapc [μKCMB] *TBD *TBD *TBD
White noise level in timelinesd [μKCMB s1/2] 148.1 174.2 152.0
fkneed [mHz] 114.1 52.4 19.7
1/f sloped -0.92 -0.88 -1.20
Overall calibration uncertaintye [%] 0.35 0.26 0.29
Systematic effects uncertainty in Stokes I f [μKCMB] 0.88 1.97 1.87
Systematic effects uncertainty in Stokes Q f [μKCMB] 1.11 1.14 2.25
Systematic effects uncertainty in Stokes U f [μKCMB] 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, Ωeff = mean(Ω). These values are used in the source extraction pipeline (Planck-2015-A35[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. ↑ 1.01.1 Planck 2015 results. II. LFI processing, Planck Collaboration, 2016, A&A, 594, A2.
  2. ↑ Planck 2015 results. XXVI. The second Planck catalogue of compact sources, Planck Collaboration, 2016, A&A, 594, A26.
  3. ↑ 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

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