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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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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Quantification of the performance of LFI is summarized in Table 1 below. All the details can be found in the LFI data processing paper <span style="color:red"> Include Planck DPC Paper 2018</span>.
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<!-- {{PlanckPapers|planck2013-p02}} -->
 
  
  
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|width="320" | Effective beam FWHM<sup>b</sup> [arcmin]
 
|width="320" | Effective beam FWHM<sup>b</sup> [arcmin]
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|width="100" | 32.29
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|width="100" | 32.29 (TBC)
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|width="100" | 27.00
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|width="100" | 27.00 (TBC)
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|width="100" | 13.21
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|width="100" | 13.21 (TBC)
 
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|-
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|width="320" | White noise level in map<sup>c</sup> [&mu;K<sub>CMB</sub>]
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|width="320" | White noise level in timelines<sup>c</sup> [&mu;K<sub>CMB</sub> s<sup>1/2</sup>]
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|width="100" | *TBD
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|width="100" | 147.9
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|width="100" | *TBD
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|width="100" | 174.0
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|width="100" | *TBD
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|width="100" | 151.9
 
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|-
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|width="320" | White noise level in timelines<sup>d</sup> [&mu;K<sub>CMB</sub> s<sup>1/2</sup>]
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|width="320" | <i>f</i><sub>knee</sub><sup>c</sup> [mHz]
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|width="100" | 148.1
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|width="100" | 113.9
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|width="100" | 174.2
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|width="100" | 53.0
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|width="100" | 152.0
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|width="100" | 19.6
 
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|width="320" | <i>f</i><sub>knee</sub><sup>d</sup> [mHz]
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|width="320" | 1/<i>f</i> slope<sup>c</sup>
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|width="100" | 114.1
 
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|width="100" | 52.4
 
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|width="100" | 19.7
 
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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<sup>e</sup> [%]
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|width="320" | Overall calibration uncertainty<sup>d</sup> [%]
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|width="100" | 0.35
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|width="100" | 0.17
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|width="100" | 0.26
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|width="100" | 0.12
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|width="100" | 0.29
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|width="100" | 0.20
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|width="320" | Systematic effects uncertainty in Stokes <i>I</i> <sup>f</sup> [&mu;K<sub>CMB</sub>]
 
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|width="100" | 0.88
 
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|width="100" | 1.97
 
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|width="100" | 1.87
 
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|-
 
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|width="320" | Systematic effects uncertainty in Stokes <i>Q</i> <sup>f</sup> [&mu;K<sub>CMB</sub>]
 
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|width="100" | 1.11
 
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|width="100" | 1.14
 
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|width="100" | 2.25
 
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|-
 
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|width="320" | Systematic effects uncertainty in Stokes <i>U</i> <sup>f</sup> [&mu;K<sub>CMB</sub>]
 
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|width="100" | 0.95
 
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|width="100" | 1.29
 
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|width="100" | 2.22
 
 
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<!-- {{PlanckPapers|planck2013-p05}} -->  
 
<!-- {{PlanckPapers|planck2013-p05}} -->  
  
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<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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<sup>c</sup> Typival values derived from fitting noise spectra
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<sup>d</sup> Values derived from fitting noise spectra.
 
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<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}}.
 
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<!-- {{PlanckPapers|planck2013-p02b}} -->
 
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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}}.
 
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<!-- {{PlanckPapers|planck2013-p02a}} -->
 
  
 +
<sup>d</sup> difference between first and last iteration of the iterative calibration (for 30 and 44 GHz) or E2E 2015 result (for 70 GHz). In 2015 the calibration uncertainity was 0.35% and 0.26 % at 30 and 44, respectively.
  
  

Revision as of 15:34, 5 June 2018

Quantification of the performance of LFI is summarized in Table 1 below. All the details can be found in the LFI data processing paper Include Planck DPC Paper 2018.


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 (TBC) 27.00 (TBC) 13.21 (TBC)
White noise level in timelinesc [μKCMB s1/2] 147.9 174.0 151.9
fkneec [mHz] 113.9 53.0 19.6
1/f slopec -0.92 -0.88 -1.20
Overall calibration uncertaintyd [%] 0.17 0.12 0.20

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-A26[1]).

c Typival values derived from fitting noise spectra

d difference between first and last iteration of the iterative calibration (for 30 and 44 GHz) or E2E 2015 result (for 70 GHz). In 2015 the calibration uncertainity was 0.35% and 0.26 % at 30 and 44, respectively.


References[edit]

  1. ↑ Planck 2015 results. XXVI. The second Planck catalogue of compact sources, Planck Collaboration, 2016, A&A, 594, A26.

(Planck) Low Frequency Instrument

Data Processing Center

Full-Width-at-Half-Maximum

To be confirmed

Cosmic Microwave background

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