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The mass-sheet degeneracy and time-delay cosmography: analysis of the strong lens RXJ1131-1231

Amara, Adam; Refregier, Alexandre; Birrer, Simon

We present extended modelling of the strong lens system RXJ1131-1231 with archival data in two HST bands in combination with existing line-of-sight contribution and velocity dispersion estimates. Our focus is on source size and its influence on time-delay cosmography. We therefore examine the impact of mass-sheet degeneracy and especially the dege…