Forecast of Joint Analysis of Cosmic Shear and Supernovae Magnification from CSST and LSST

Cosmic shear and cosmic magnification reflect the same gravitational lensingfield. Each of these two probes are affected by different systematics. We studythe auto- and cross-correlations of the cosmic shear from the China SpaceSurvey Telescope (CSST) and cosmic magnification of supernovae from LargeSynoptic Survey Telescope (LSST). We want to answer, to what extent, by addingthe magnification data we can remove the systematic bias in cosmic shearmeasurement. We generate the mock shear/magnification maps based on thecorrelation between of different tomographic bins. After obtaining thecorrected power spectra, we adopt the Markov Chain Monte Carlo (MCMC) techniqueto fit the theoretical models, and investigate the constraints on thecosmological and nuisance parameters. We find that the with only cosmic sheardata, there are 1σ bias in σ_8 and intrinsic alignment modelparameters. By adding the magnification data, we are able to remove thesebiases perfectly.