Difference: SpirePhotometerBeamProfile (4 vs. 5)

Revision 52013-07-10 - 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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Measured with Neptune spectrum 450 795 1665
SPIRE photometer reference spectrum (nu*F_nu = const.) 465 822 1768
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The values in the first line were measured from a very finely sampled observation of Neptune as outlined below. Note that these are only accurate for a source of the same spectral shape. Since SPIRE flux densities for point sources are conventionally quoted for the reference wavelengths 250, 350, and 500 microns, assuming a source spectrum rising proportionally to wavelength (nu*F_nu=const.), we can adopt the same convention for (infinitely) extended sources. In this case the values in the second line apply. For sources of other colors a correction will have to be applied. The radial model beam profile described in a technical document by North, Griffin, Amaral-Rogers 2011 (v2.6) with the data files given below can be used to calculate such.
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The values in the first line were measured from a very finely sampled observation of Neptune as outlined below. Note that these are only accurate for a source of the same spectral shape. Since SPIRE flux densities for point sources are conventionally quoted for the reference wavelengths 250, 350, and 500 microns, assuming a source spectrum rising proportionally to wavelength (nu*F_nu=const.), we can adopt the same convention for (infinitely) extended sources. In this case the values in the second line apply. For sources of other colors a correction will have to be applied. The radial model beam profile is described in Griffin et al. 2013 and the data files given below can be used to calculate such beam profiles.
 

Normalized Beam Profile Products to Download

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  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.
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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:
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The radial beam profile model for SPIRE was developed and described by Griffin et al. 2013. The peak normalized monochromatic flux, depending on the distance from the peak (Theta) can be described as:
 
 
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