The lens parallax method: determining the redshifts of the faint blue galaxies through gravitational lensing

摘要: We propose a new technique, which we call the lens parallax method, to determine simultaneously redshift distribution of faint blue galaxies and mass foreground clusters galaxies. The method is based on gravitational lensing uses fact that mean angular size well-determined function surface brightness. requires first calibration angular-size vs. brightness relation in unlensed blank fields determination brightest By combining this information with observations distorted images background clusters, show it possible obtain as their With sample about ten moderate rich using bins brightness, bin-to-bin signal-to-noise ratio $\sim3.5$ can be achieved. allows convergence shear cluster position, through obtained. used conjunction with, will improve accuracy of, other previously proposed techniques for mapping clusters.