The impact of the point spread function fitting radius on photometric uncertainty based on the Fisher information matrix

Open Access

Fig. 3

Normalized discrepancy (vertical axis, Eq. (38)) as a function of aperture radius and separation between the contaminating star (SBS) and the target (horizontal axis), for two contamination scenarios. The left panel corresponds to a faint contaminant (F = 2000 [photo-e⁻], F_K = 1000 [photo-e⁻], K = 1), while the right panel shows the effect of a brighter one (F = 2000 [photo-e⁻], F_K = 2500 [photo-e⁻], K = 1). Colors indicate the fractional loss of Fisher information relative to the full-pixel case.

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