Institute for Advanced Study Informal Astrophysics Seminar

ABSTRACT: Wide area surveys in mm/submm-wave (SPT, Herschel, ACT, Planck) have discovered a large population of strongly lensed, dusty, star-forming galaxies (DSFGs) at very high redshifts (2<z<6). I will present ALMA observations of a sample of strongly lensed DSFGs discovered by the South Pole Telescope and review the main science results. I will then present our current program to map the small scale structure of dark matter halos using these lenses. I will discuss methods of detecting low-mass dark matter subhalos and measuring the power spectrum of dark matter in the lenses (using gravitationally induced image perturbations). The results of this study are expected to place new constraints on particle properties of dark matter.