Space Telescope Science Institute   5.6.2 Model PSFs  5.6.4 Geometric Distortions

5.6.3 Encircled Energy


In general, the ACS channels encircled energy distribution has been found to be within the original instrument specifications. Figure 5.9 and Figure 5.10 show the ACS encircled energy curves derived from on-orbit images. Tabulated values of the encircled energy for most filters are available in Sirianni et al. (2005, astroph/0507614) (http://adcam.pha.jhu.edu/instrument/photometry/sirianni.pdf).


 5.6.2 Model PSFs  5.6.4 Geometric Distortions
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