Statistics – Applications
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aglu.proge..10g&link_type=abstract
Presented at the KITP Program: Applications of Gravitational Lensing: Unique Insights into Galaxy Formation and Evolution, Sep 2
Statistics
Applications
Scientific paper
I will present the gravitational lens modeling for a new example of athree-component source for which each component is quadruply imaged. Thelens 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 theexcellent angular resolution of HST/ACS, the properties of the lens canbe measured accurately. I will discuss several macroscopic models forthe lens galaxy. In particular, I will examine a lens model in terms ofa singular isothermal sphere with external shear. The shear directionpoints to the cluster central mass peak and the shear modulus gives anapproximate estimate of the large-scale mass, in agreement with theestimates derived from X-ray and weak lensing analyses. Then, bycombining lensing analysis and spectroscopic measurements, a lower limitto the unknown redshift of the source can be found. Finally, I will showthat the estimate of the projected mass inside the Einstein radius,which is a function of the source distance, can be entirely ascribed tothe galaxy or partly to the galaxy and partly to the cluster, but itdoes not depend on the details of the adopted model.
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