A Mid-Infrared Survey of Gravitational Lenses

Details A Mid-Infrared Survey of Gravitational Lenses A Mid-Infrared Survey of Gravitational Lenses

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20451k&link_type=abstract

Spitzer Proposal ID #20451

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Scientific paper

We will use mid-IR IRAC images of six gravitational lenses to understand a basic problem of gravitational lenses -- why simple lens models explain the image positions but not the image fluxes. We know from models of lensed quasar host galaxies observed by HST that the problem does not lie in our models for the gravitational potential of the main lens galaxy. For optical and near-IR data, the explanation can be propagation effects (dust), microlensing by stars in the lens galaxy, or what is known as cold dark matter (CDM) substructure (satellites) of the lens galaxy. The mid-IR fluxes are immune to both dust and microlensing -- the wavelength is to long to be bothered by dust and the emission region is to large to be bothered by microlensing. If the mid-IR flux ratios are still unexplained by simple lens models, the cause must be the predicted (and much debated) CDM substructure. Thus, the SST/IRAC observations will provide a simple test of a basic prediction of cold dark matter models for the formation of galaxies.

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