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Local dwarf spheroidal galaxies (dSphs) are nearby dark-matter dominatedsystems, making them excellent targets for searching for gamma rays fromparticle dark matter interactions. If dark matter annihilates or decaysdirectly into two gamma rays (or a gamma ray and a neutral particle), amonochromatic spectral line is created. At TeV energies, no other processes areexpected to produce spectral lines, making this a very clean indirect darkmatter search channel. With the development of event-by-event energyreconstruction, we can now search for spectral lines with the High AltitudeWater Cherenkov (HAWC) Observatory. HAWC is a wide field of view surveyinstrument located in central Mexico that observes gamma rays from <1 TeV to>100 TeV. In this work we present results from a recent search for spectrallines from local, dark matter dominated dwarf galaxies using 1038 days of HAWCdata. We also present updated limits on several continuum channels that werereported in a previous publication. Our gamma-ray spectral line limits are themost constraining obtained so far from 20 TeV to 100 TeV.

Search for Gamma-ray Spectral Lines from Dark Matter Annihilation in Dwarf Galaxies with the High-Altitude Water Cherenkov Observatory