Difference: SpirePhotometerBeamProfile (3 vs. 4)

Revision 42012-10-19 - BernhardSchulz

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META TOPICPARENT name="SpireCalibrationWeb"

SPIRE Photometer Beam Profiles

Summary of beam profile analysis and solid angle revision ( Bernhard Schulz, September 2012)
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Detector Array PSW PMW PLW
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PSF limited to 700" radius (click on the image to download)
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PSF limited to 700" radius (click on the image to enlarge)
PSF as FITS file FITS file FITS file FITS file
 
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Radialized Beam Profile Model

 
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Datasets to construct a radial beam profile model are available too. These allow to take into account the color dependent FWHM of the true beam profiles.
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Radial Beam Profile Model

Datasets to construct the radial beam profile model are available below. These allow to take into account the color dependent FWHM of the true beam profiles.

The radial beam profile model for SPIRE was developed and described by North, Griffin, Amaral-Rogers 2011 (v2.6). The peak normalized monochromatic flux, depending on the distance from the peak (Theta) can be described as:

A value of -0.85 should be adopted for gamma, which controls the dependence of the FWHM of the variable part of the beam on wavelength. The reference frequency nu_eff is the isophotal frequency for the product of the spectrum of Neptune and the respective SPIRE spectral filter profile.

 
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Radial beam profile model Values are given for radii in 1 arcsec steps starting at 0
Detector Core (variable) part Constant part
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Radial beam profile model Values are given for radii in 1 arcsec steps starting at 0
Detector Core (variable) part Constant part
 
PSW PSW_Core.csv PSW_Constant.csv
PMW PMW_Core.csv PMW_Constant.csv
PLW PLW_Core.csv PLW_Constant.csv
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Solid angles derived from integrating the radial beam profile model over area and frequency were consistent with the numbers above within 1.5%.
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Solid angles derived from integrating this radial beam profile model over area and frequency were consistent with the numbers above within 1.5%.
 

Analysis Details

 
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