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Dark matter subhalos with extended profiles and density cores, and globularstars clusters of mass $10^6-10^8 M_\odot$, that live near the critical curvesin galaxy cluster lenses can potentially be detected through their lensingmagnification of stars in background galaxies. In this work we study the effectsuch subhalos have on lensed images, and compare to the case of more wellstudied microlensing by stars and black holes near critical curves. We findthat the cluster density gradient and the extended mass distribution ofsubhalos are important in determining image properties. Both lead to anasymmetry between the image properties on the positive and negative paritysides of the cluster that is more pronounced than in the case of microlensing.For example, on the negative parity side, subhalos with cores larger than about$50\,$pc do not generate any images with magnification above $\sim 100$ outsideof the immediate vicinity of the cluster critical curve. We discuss thesefactors using analytical and numerical analysis, and exploit them to identifyobservable signatures of subhalos: subhalos create pixel-to-pixel fluxvariations of $\gtrsim 0.1$ magnitudes, on the positive parity side ofclusters. These pixels tend to cluster around (otherwise invisible) subhalos.Unlike in the case of microlensing, signatures of subhalo lensing can be foundup to $1''$ away from the critical curves of massive clusters.

Flashlights: Properties of Highly Magnified Images Near Cluster Critical Curves in the Presence of Dark Matter Subhalos