Mass and Light distributions in Clusters of Galaxies - Henry A ...

Discussion
range, 1 < z < 5.
5.2 Further application of the methods in other
work
By applying my methods to carefully separate and select background galaxies
for a weak lensing study, we measured distortion effects in all four massive
clusters studied in my work, A1689, A1703, A370 & RXJ1347, and derived
the most accurate published mass profiles to date (Broadhurst et al. 2008).
In producing these profiles, we combined the strong lensing information obtained
from sets of multiple images found in high-quality HST/ACS imaging,
with the weak lensing distortion to background galaxies in deep, wide-field,
multi-band Subaru/Suprime-Cam imaging. The mass profiles all agree with
the predicted form for CDM-dominated halos, with continuously steepening
profiles, consistent with the expectation that DM is cold. In detail, however,
these profiles are somewhat more concentrated than predicted, 8 < c vir < 15
(< c vir >= 10.39 ± 0.91). If this behavior proves to be typical it will require
modification of the underlying model.
In (Broadhurst et al. 2008) we also examined the lensing magnification
effect, seen as a depletion in the surface number density profiles of red background
galaxies near the cluster center. The measured depletion compared
to the expected depletion for the best-fitting NFW density profile (derived
from the corresponding distortion profiles) were found to be consistent, which
strengthens our conclusions and more importantly establishes the utility of
the background red galaxies for measuring magnification. By combining
magnification and distortion we improve upon the accuracy of lensing mass
determinations.
Further implementation of the color-color selection method was used to
study the mass structure of the galaxy cluster Cl0024+17 in Umetsu et al.
(2009) and in Zitrin et al. (2009b). Based on deep Subaru BR c z ′ imaging
and our recent comprehensive strong lensing analysis of HST/ACS/NIC3
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