Schedule Sep 28, 2006
Strong Lensing by a Galaxy Member of the Distant Cluster Cl J0152.7-1357
Mr. Claudio Grillo, Univ. Milano & KITP

I will present the gravitational lens modeling for a new example of a three-component source for which each component is quadruply imaged. The lens is a massive galaxy member of the cluster Cl J0152.7-1357 at z ~ 0.8. By taking advantage of this exceptional configuration and of the excellent angular resolution of HST/ACS, the properties of the lens can be measured accurately. I will discuss several macroscopic models for the lens galaxy. In particular, I will examine a lens model in terms of a singular isothermal sphere with external shear. The shear direction points to the cluster central mass peak and the shear modulus gives an approximate estimate of the large-scale mass, in agreement with the estimates derived from X-ray and weak lensing analyses. Then, by combining lensing analysis and spectroscopic measurements, a lower limit to the unknown redshift of the source can be found. Finally, I will show that the estimate of the projected mass inside the Einstein radius, which is a function of the source distance, can be entirely ascribed to the galaxy or partly to the galaxy and partly to the cluster, but it does not depend on the details of the adopted model.

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