Difference between revisions of "Summary LFI"

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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|planck2013-p02}}.
 
The LFI performance are summarized in Table 1 below. All the details can be found in the LFI data processing paper {{PlanckPapers|planck2013-p02}}.
  
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=== Summary of LFI Performance ===
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A summary of the LFI performance parameters is given in the table 3 below.
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{| border="1" cellspacing="0" cellpadding="2" align="center"
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|+ '''Table 3. LFI performance parameters'''
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|-
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!scope="col"| Parameter
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!scope="col"| 30 GHz
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!scope="col"| 44 GHz
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!scope="col"| 70 GHz
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|-
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|width="300" | Center frequency [GHz]
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|width="100" | 28.4
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|width="100" | 44.1
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|width="100" | 70.4
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|-
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|width="300" | Scanning beam FWHM<math>^{\rm a}</math> [arcmin]
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|width="100" | 33.10
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|width="100" | 27.94
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|width="100" | 13.08
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|-
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|width="300" | Scanning beam ellipticity<math>^{\rm a}</math>
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|width="100" | 1.37
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|width="100" | 1.25
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|width="100" | 1.27
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|-
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|width="300" | Effective beam FWHM<math>^{\rm b}</math> [arcmin]
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|width="100" | 32.29
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|width="100" | 27.00
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|width="100" | 13.21
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|-
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|width="300" | White noise level in map<math>^{\rm c}</math> [<math>\mu</math>K<math>_{CMB}</math>]
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|width="100" | *TBD
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|width="100" | *TBD
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|width="100" | *TBD
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|-
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|width="300" | White noise level in timelines<math>^{\rm d}</math> [<math>\mu</math>K<math>_{CMB} \;s^{1/2}</math>]
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|width="100" | 148.1
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|width="100" | 174.2
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|width="100" | 152.0
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|-
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|width="300" | f<math>_{\rm knee}^{\rm d}</math> [mHz]
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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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|-
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|width="300" | 1/<math>f</math> slope<math>^{\rm d}</math>
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|width="100" | -0.92
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|width="100" | -0.88
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|width="100" | -1.20
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|-
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|width="300" | Overall calibration uncertainty<math>^{\rm e}</math> [%]
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|width="100" | *TBD
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|width="100" | *TBD
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|width="100" | *TBD
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|-
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|width="300" | Systematic effects uncertainty<math>^{\rm f}</math> [<math>\mu</math>K<math>_{CMB}</math>]
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|width="100" | *TBD
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|width="100" | *TBD
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|width="100" | *TBD
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|-
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|}
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 +
 +
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<math>^{\rm a}</math> Determined by fitting Jupiter observations directly in the timelines.
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<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|planck2013-p05}}.
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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.
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<math>^{\rm d}</math> Values derived from fitting noise spectra.
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 +
<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|planck2013-p02b}}.
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<math>^{\rm f}</math> Peak-to-peak difference between 99% and 1% quantities in the pixel value
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distributions from simulated maps (see {{PlanckPapers|planck2013-p02a}}.
  
 
<center>
 
<center>

Revision as of 12:07, 16 December 2014

The LFI performance are summarized in Table 1 below. All the details can be found in the LFI data processing paper Planck-2013-II[1].

Summary of LFI Performance[edit]

A summary of the LFI performance parameters is given in the table 3 below.

Table 3. LFI performance parameters
Parameter 30 GHz 44 GHz 70 GHz
Center frequency [GHz] 28.4 44.1 70.4
Scanning beam FWHM[math]^{\rm a}[/math] [arcmin] 33.10 27.94 13.08
Scanning beam ellipticity[math]^{\rm a}[/math] 1.37 1.25 1.27
Effective beam FWHM[math]^{\rm b}[/math] [arcmin] 32.29 27.00 13.21
White noise level in map[math]^{\rm c}[/math] [[math]\mu[/math]K[math]_{CMB}[/math]] *TBD *TBD *TBD
White noise level in timelines[math]^{\rm d}[/math] [[math]\mu[/math]K[math]_{CMB} \;s^{1/2}[/math]] 148.1 174.2 152.0
f[math]_{\rm knee}^{\rm d}[/math] [mHz] 114.1 52.4 19.7
1/[math]f[/math] slope[math]^{\rm d}[/math] -0.92 -0.88 -1.20
Overall calibration uncertainty[math]^{\rm e}[/math] [%] *TBD *TBD *TBD
Systematic effects uncertainty[math]^{\rm f}[/math] [[math]\mu[/math]K[math]_{CMB}[/math]] *TBD *TBD *TBD


[math]^{\rm a}[/math] 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 Planck-2013-XXVIII[2].

[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.

[math]^{\rm d}[/math] Values derived from fitting noise spectra.

[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 \lt \ell \lt 250 [/math] (see Planck-2013-V[3].

[math]^{\rm f}[/math] Peak-to-peak difference between 99% and 1% quantities in the pixel value distributions from simulated maps (see Planck-2013-III[4].

Table 1. Summary of the LFI performance parameters

[math]^{ \rm a \, }[/math] FWHM and ellipticity from scanning beam evaluated fitting Jupiter directly in the timelines. [math]\hspace{480mm} [/math] [math]^{ \rm b \, }[/math] FWHM from effective beam estimated from the main beam solid angle of the effective beam. Those are the values used in the source extraction pipeline Planck-2013-XXVIII[2]. [math]{\hspace{35mm}}[/math] [math]^{ \rm c \, }[/math] White noise per pixel computed from half-ring difference maps. Those values are within the 1% with the white noise sensitivity computed directly on the timelines, taking in account the actual mission time minus the manoeuvres and bad-science flagged data.


References[edit]

  1. Planck 2013 results. II. Low Frequency Instrument data processing, Planck Collaboration, 2014, A&A, 571, A2
  2. 2.02.1 Planck 2013 results. XXVIII. The Planck Catalogue of Compact Sources, Planck Collaboration, 2014, A&A, 571, A28
  3. Planck 2013 results. V. LFI Calibration, Planck Collaboration, 2014, A&A, 571, A5
  4. Planck 2013 results. III. Low Frequency Instrument systematic uncertainties, Planck Collaboration, 2014, A&A, 571, A3

(Planck) Low Frequency Instrument

Full-Width-at-Half-Maximum

Cosmic Microwave background

To be defined / determined