Gravitational Lensing as a Probe of Cold Dark Matter Subhalos
Figure 6
A foreground galaxy with a dark matter halo produces multiple macroimages of a background light source. A subhalo located in the dark halo intercepts one of these macroimages, which may give rise to (a) additional image small-scale splitting of the affected macroimage if the source is sufficiently small, or (b) a mild distortion in the affected macroimage, if the source is large.