Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11701t&link_type=abstract
HST Proposal ID #11701. Cycle 17
Physics
Scientific paper
The structure, formation and evolution of early-type galaxies is still largely an open problem in cosmology: how does the Universe evolve from large linear scales dominated by dark matter to the non-linear scales of galaxies, where baryons and dark matter both play important, interacting, roles? To understand the complex physical processes involved in their formation scenario, it is critically important to understand the relative distribution of luminous and dark matter at galactic scales. Over the last four years, using HST, the SLACS collaboration has discovered some 100 new gravitational lenses and developed a toolbox to tackle these issues by combining new non-parametric strong lensing techniques, stellar dynamics, and weak gravitational lensing. Among the 100 new lenses, we discovered the first double Einstein Ring, the so-called "jackpot". The presence of two rings at different radii provides qualitatively new insights into the distribution of luminous and dark matter at 10 kpc scales. Via a joint lensing and dynamical analysis, this system has the potential to deliver the most precise measurements on galactic scales of the inner slope of dark matter halos, of the total mass profile, and of the stellar mass to light ratio. Unfortunately, the precision is currently limited by the lack of a redshift for the outer ring, in spite of ultradeep spectroscopy at the 10m Keck Telescope. We propose to otbain F336W and F438W WFC3 images of the system, which in combination with our existing F606W, F814W and F160W images will allow us to obtain a photo-z for the outer ring, precise enough to fully realize the potential of this system. The multicolor HST images will also be used to derive a stellar mass-to-light and constrain the initial mass function by comparison with the lens and dynamical measurement.;
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