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Systematic errors in the galaxy redshift distribution $n(z)$ can propagate tosystematic errors in the derived cosmology. We characterize how the degenerateeffects in tomographic bin widths and galaxy bias impart systematic errors oncosmology inference using observational data from the Deep Lens Survey. Forthis we use a combination of galaxy clustering and galaxy-galaxy lensing. Wepresent two end-to-end analyses from the catalogue level to parameterestimation. We produce an initial cosmological inference using fiducialtomographic redshift bins derived from photometric redshifts, then compare thiswith a result where the redshift bins are empirically corrected using a set ofspectroscopic redshifts. We find that the derived parameter $S_8 \equiv\sigma_8 (\Omega_m/.3)^{1/2}$ goes from $.841^{+0.062}_{-.061}$ to$.739^{+.054}_{-.050}$ upon correcting the n(z) errors in the second method.

The Impact of Tomographic Redshift Bin Width Errors on Cosmological Probes