Redshifts of the Gravitational Lenses B1422+231 and PG 1115+080
Redshifts of the Gravitational Lenses B1422+231 and PG 1115+080
B1422+231 and PG1115+080 are gravitational lens systems producing quadruple QSO images where there is real promise that time delays can constrain the Hubble constant. In addition, the lensing galaxies are both part of groups which can play an important role in modelling the lens potential. This article reports redshifts for …