Perspective of monochromatic gamma-ray line detection with the High Energy cosmic-Radiation Detection (HERD) facility onboard China’s space station

HERD is the High Energy cosmic-Radiation Detection instrument proposed to operate onboard China’s space station in the 2020s. It is designed to detect energetic cosmic ray nuclei, leptons and photons with a high energy resolution ( ∼ 1% for electrons and photons and 20% for nuclei) and a large geometry factor ( > 3 m 2 sr for electrons and diffuse photons and > [2] m 2 sr for nuclei). In this work we discuss the capability of HERD to detect monochromatic γ -ray lines, based on simulations of the detector performance. It is shown that HERD will be one of the most sensitive instruments for monochromatic γ -ray searches at energies between ∼ 10 to a few hundred GeV. Above hundreds of GeV, Cherenkov telescopes will be more sensitive due to their large effective area. As a specific example, we show that a good portion of the parameter space of a supersymmetric dark matter model can be probed with HERD.

Note:

9 pages, 7 figures, matches version published in Astropart.Phys

95.35.+d
95.85.Pw
Gamma ray line
Dark matter
MSSM
cosmic radiation: energy
energy: high
nucleus: cosmic radiation
energy resolution: high
supersymmetry: parameter space

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