About the Optimum Aperture Radius for a Gaussian Profile
We derive the optimum aperture size for photometry of sources whose Point Response Function
(PRF) profiles can be approximated as Gaussian. By optimum, we mean the aperture size (radius
Rmax) which maximizes the signal-to-noise ratio. If you’re after the answer right away, here it is:
Rmax ~1.5852σ = 0.6731 FWHM,
where σ and FWHM (Full Width Half Maximum) characterize the Gaussian profile’s width
About An Introduction to Astronomical Photometry Using CCDs
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