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Short-lived mediators are often used to describe dark matter interactionswith Standard Model particles. When the dark matter mass is heavier than themass of the mediator, it may self-annihilate into short-lived mediators, and insome cases this might be the dominant annihilation channel. This scenario isknown as secluded dark matter. We use Fermi-LAT observations of dwarfspheroidal galaxies, H.E.S.S. data from the Galactic center, and Planckmeasurements of the Cosmic Microwave Background to constrain secluded darkmatter. We explore the interplay between these experiments and we assess theimpact of the mediator mass on our bounds, an often overlooked yet veryimportant point. In particular, we exclude pair -annihilation cross-sectionsgreater or on the order of $\sigma v \sim 4 \times 10^{-27} {\rm cm^3/s}$ fordark matter masses around $10$~GeV and greater or on the order of $\sigma v\sim \times 10^{-25} {\rm cm^3/s}$ for dark matter masses around a TeV. Ourfindings supersede previous constraints which use Fermi-LAT data, andconstitute the first limits on secluded dark sectors using the H.E.S.S.telescope. We also show that one can fit TeV gamma-ray observations fromH.E.S.S. with secluded dark matter annihilations, with the mediator massimpacting the best-fit dark matter particle mass. Our findings indicate thatany assessment of secluded dark sectors in the context of indirect detectionsignificantly depends on the choice of the mediator mass.

Searching for Secluded Dark Matter with H.E.S.S., Fermi-LAT, and Planck