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Accurate weak lensing mass estimates of clusters are needed in order tocalibrate mass proxies for the cosmological exploitation of galaxy clustersurveys. Such measurements require accurate knowledge of the redshiftdistribution of the weak lensing source galaxies. In this context, weinvestigate the accuracy of photometric redshifts (photo-$z$s) computed by the3D-HST team for the Cosmic Assembly Near-infrared Deep Extragalactic LegacySurvey fields, which provide a relevant photometric reference data set for deepweak lensing studies. Through the comparison to spectroscopic redshifts andphoto-$z$s based on very deep data from the Hubble Ultra Deep Field, weidentify catastrophic redshift outliers in the 3D-HST/CANDELS catalogue. Thesewould significantly bias weak lensing results if not accounted for. Weinvestigate the cause of these outliers and demonstrate that the interpolationof spectral energy distribution (SED) templates and a well-selected combinationof photometric data can reduce the net impact for weak lensing studies.

Testing the accuracy of 3D-HST photometric redshift estimates as reference samples for deep weak lensing studies