Difference: SpirePhotometerBeamProfileAnalysis2 (5 vs. 6)

Revision 62015-03-25 - BernhardSchulz

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Table 2: Variations in integrated solid angle due to different background removal procedures.
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The subtraction of the background observations has minimized the differences delivered by these various methods. Thus we choose removing the simple median of all data points outside the 600" radius around the center.
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The subtraction of the background observations has minimized the differences delivered by these various methods. Visual inspection of the background subtracted maps shows that for the 1" resolution maps the useful area stops outside of 750" because of too many NaNs. Thus we choose subtracting the simple median of all data points between 600" and 750" radius around the center.
 
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 Figure 4: Overplot of Triton positions during the observation over PSW isophotes of the Neptune map as thick black trace. The levels are in Jy and the small tick marks on the side are arc seconds.
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Radial Beam Profiles

Since the ellipticity of the beam is moderate a radial beam profile can be calculated to study the far field at a better S/N. The beam center is fitted with a Gaussian, and average map values within concentric annuli of 1" radial difference around that center are calculated. Plots of these profiles versus radius are shofn in Figure 5.
 
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Figure 5: TBW.
 
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Solid Angles

After background tilt subtraction and background source removal the signal was averaged over concentric annuli around the source and this radialized beam profile was plotted against radius (Plot 1). To ensure symmetry, e.g. flatness of the background, the same was also plotted for three sectors (Plot 2 and 3). From the radialized beam profile a new background was determined and subtracted based on the necessity to have only positive flux within the errors (Plot 4).
 
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