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We study a simple model of vector dark matter that couples to Standard Modelparticles via magnetic dipole interactions. In this scenario, the cosmologicalabundance arises through the freeze-in mechanism and depends on the dipolecoupling, the vector mass, and the reheat temperature. To ensure cosmologicalmetastability, the vector must be lighter than the fermions to which itcouples, but rare decays can still produce observable 3$\gamma$ final states;two-body decays can also occur at one-loop with additional weak suppression,but are subdominant if the vector couples mainly to light fermions. Forsufficiently heavy vectors, induced kinetic mixing with the photon can alsoyield additional two body decays to lighter fermions and predict indirectdetection signals through final state radiation. We explore the implications ofcouplings to various flavors of visible particles and emphasize leptophilicdipoles involving electrons, muons, and taus, which offer the most promisingindirect detection signatures through 3$\gamma$, $e^+ e^- \gamma$, and $\mu^+\mu^- \gamma$ decay channels. We also present constraints from current and pasttelescopes, and sensitivity projections for future missions includinge-ASTROGAM and AMEGO.

Freezing In Vector Dark Matter Through Magnetic Dipole Interactions