Perspective on dark matter annihilation limits from the LHAASO gamma-ray observation of dwarf Spheroidal galaxies
2019 July 22
The Large High Altitude Air Shower Observatory (LHAASO) is a next generation observatory for high energy gamma-rays and cosmic rays with a wide field of view, which is sensitive to gamma-rays from 300 GeV to 1 PeV. LHAASO is an ideal experiment to explore the gamma-ray signatures induced by annihilation of heavy dark matter(DM) particles in dwarf spheroidal satellite galaxies(dSphs). In this study, we investigate the LHAASO sensitivity to the DM annihilation at DM masses above 1TeV. We consider nineteen dSphs with large J−factors and incorporate the statistical uncertainties of the J−factor in a combined analysis. Comparing with current limits, we find that LHAASO is sensitive to the annihilation signatures for DM masses from several TeV up to 100 TeV.