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Fig. 2

image

Square root of the CRLB in mas as a function of detector pixel size Δx in arcseconds when the background flux per pixel is given by Eq. (9) with b = 2000e/arcsec, D is zero, and RON = 5 e. The solid lines (thin, normal, and bold) are for the PSF of a non-moving Gaussian source with F = 6000e and an image quality with an FWHM of 0.5, 1.0, and 1.5′′, respectively (all centered on a given pixel). The dashed lines correspond to the same curves computed for a slow-moving source with a drifting parameter equal to the FWHM that was used to compute each line. The upper dash-dotted line is similar to the lower dashed line (FWHM = 0.5′′), but for a source ten times fainter (F = 600e).

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