Strong-lensing analysis of a complete sample of 12 MACS clusters at z > 0.5: mass models and Einstein radii

We present the results of a strong-lensing analysis of a complete sample of 12 very luminous X-ray clusters at z > 0:5 using HST/ACS images. Our modelling technique has uncovered some of the largest known critical curves outlined by many accuratelypredicted sets of multiple images. The distribution of Einstein radii has a median value of’ 28 00 (for a source redshift of zs 2), twice as large as other lower-z samples, and extends to 55 00 for MACS J0717.5+3745, with an impressive enclosed Einstein mass of 7:4 10 14 M . We

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