Correcting cosmological parameter biases for all redshift surveys induced by estimating and reweighting redshift distributions

Understand

Photometric redshift uncertainties are a major source of systematic error for ongoing and future photometric surveys.

• We study different sources of redshift error caused by choosing a suboptimal redshift histogram bin width and propose methods to resolve them.
• The selection of a too large bin width is shown to oversmooth small scale structure of the radial distribution of galaxies.
• This systematic error can significantly shift cosmological parameter constraints by up to $6 \, \sigma$ for the dark energy equation of state parameter $w$.