We present a reconstruction of the mass distribution of galaxy cluster Abell 1689 at z = 0.18 using detected strong lensing features from deep acs observations and extensive ground based spectroscopy .
Earlier analyses have reported up to 32 multiply imaged systems in this cluster , of which only 3 were spectroscopically confirmed .
In this work , we present a parametric strong lensing mass reconstruction using 34 multiply imaged systems of which 24 have newly determined spectroscopic redshifts , which is a major step forward in building a robust mass model .
In turn , the new spectroscopic data allows a more secure identification of multiply imaged systems .
The resultant mass model enables us to reliably predict the redshifts of additional multiply imaged systems for which no spectra are currently available , and to use the location of these systems to further constrain the mass model .
In particular , we have detected 5 strong galaxy-galaxy lensing systems just outside the Einstein ring region , further constraining the mass profile .
Using our strong lensing mass model , we predict on larger scale a shear signal which is consistent with that inferred from our large scale weak lensing analysis derived using cfh12k wide field images .
Thanks to a new method for reliably selecting a well defined background lensed galaxy population , we resolve the discrepancy found between the nfw concentration parameters derived from earlier strong and weak lensing analysis .
The derived parameters for the best fit nfw profile is found to be c _ { 200 } = 7.6 \pm 1.6 and r _ { 200 } = 2.16 \pm 0.10 h ^ { -1 } _ { 70 } Mpc ( corresponding to a 3 d mass equal to M _ { 200 } = 1.32 \pm 0.2 \times 10 ^ { 15 } h _ { 70 } M _ { \sun } ) .
We find that the projected mass enclosed within the Einstein radius for Abell 1689 is M ( 45 \arcsec ) = 1.91 \pm 0.27 \times 10 ^ { 14 } h _ { 70 } M _ { \sun } .
The large number of new constraints incorporated in this work makes Abell 1689 the most reliably reconstructed cluster to date .
This well calibrated mass model , which we here make publicly available , will enable us to exploit Abell 1689 efficiently as a gravitational telescope , as well as to potentially constrain cosmology .