2008

A New Channel for Detecting Dark Matter Substructure in Galaxies: Gravitational Lens Time Delays

Keeton, Charles R., Moustakas, Leonidas A.

Understand

We show that dark matter substructure in galaxy-scale halos perturbs the time delays between images in strong gravitational lens systems.

The variance of the effect depends on the subhalo mass function, scaling as the product of the substructure mass fraction and a characteristic mass of subhalos (namely <m^2>/<m>).
Time delay perturbations therefore complement gravitational lens flux ratio anomalies and astrometric perturbations by measuring a different moment of the subhalo mass function.
Unlike flux ratio anomalies, "time delay millilensing" is unaffected by dust extinction or stellar microlensing in the lens galaxy.

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