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Fig. 8

image

Results of the measurement of reff/reff,true by GALFIT and the linear regression method, as a function of the size of the fitting area, for various S/N. The simulated galaxy is a Sérsic profile with n = 3 and a half-light radius of 10 pixels. The left-hand panels show the result from GALFIT, and the right-hand panel from the linear regression method. The top panels correspond to S/N = 800, the middle panels, S/N = 170, and the bottom panels, S/N = 50. The vertical axis is the measured reff/reff,true. The horizontal line represents reff/reff,true = 1. The horizontal axis shows the size of the fitting region in units of reff,true, ranging from 1 reff,true to 5 reff,true. The stars are the results for n = 4, and the crosses for the correct value n = 3. Because they are smaller than the symbol size, the σrand error bars are not shown in order not to impair the readability of this figure.

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