March 28th, 2016
The main cause of this reduced signal is the blurring of galaxy images by atmospheric seeing, but the overall factor by which the reconstructed surface density is reduced depends also on the signal to noise ratio in the CCD frame and on both the sizes of galaxy images and the magnitude limit of the sample that is analysed. We propose a method for estimating a multiplicative compensation factor, f, directly from a CCD frame which can then be used to correct the surface density estimates given by the Kaiser Squires formalism. We test our technique using a lensing cluster drawn from a cosmological N body simulation with a variety of realistic background galaxy populations and observing conditions.
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