The Large Zenith Telescope: Redshifts and Physical Parameters of Faint Objects from a Principal Component Analysis

The future Large Zenith Telescope Survey will provide a catalog of spectrophotometric energy distributions (40 filters) of ~10^6 objects. In this paper, we shows that the principal component analysis is efficient to separate stars, galaxies and QSOs. Realistic simulations are performed to assess quantitatively the efficiency of the method. Redshifts can be evaluated to sigmaz~0.02 for z<0.5 and sigmaz~0.05 for 0.5