Search for the gamma-ray spectral lines with the DAMPE and the Fermi-LAT observations

Abstract

Weakly interacting massive particles, as a major candidate of dark matter (DM), may directly annihilate or decay into high-energy photons, producing monochromatic spectral lines in the gamma-ray band. These spectral lines, if detected, are smoking-gun signatures for the existence of new physics. Using the 5 years of DAMPE and 13 years of Fermi-LAT data, we search for line-like signals in the energy range of 3 GeV to 1 TeV from the Galactic halo. Different regions of interest are considered to accommodate different DM density profiles. We do not find any significant line structure, and the previously reported line-like feature at $\sim$133 GeV is also not detected in our analysis. Adopting a local DM density of ${\rho }_{\mathrm{local}}=0.4\mathrm{GeV}\mathrm{c}{\mathrm{m}}^{-3}$, we derive 95% confidence level constraints on the velocity-averaged cross-section of $⟨\sigma v{⟩}_{\gamma \gamma }\lesssim 4\times 10^{-28}\mathrm{c}{\mathrm{m}}^3{\mathrm{s}}^{-1}$ and the decay lifetime of ${\tau }_{\gamma \nu }\gtrsim 5\times 10^{29}\mathrm{s}$ at 100 GeV, achieving the strongest constraints to date for the line energies of 6-660 GeV. The improvement stems from the longer Fermi-LAT data set used and the inclusion of DAMPE data in the analysis. The simultaneous use of two independent data sets could also reduce the systematic uncertainty of the search.

14 pages, 10 figures. Accepted for publication in PRD

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• Search for GeV gamma-ray emission from SPT-CL J2012-5649 with six years of DAMPE data
• PSF Calibration of DAMPE for gamma-ray Observations
• Observations of the Fermi bubbles and the Galactic center excess with the DArk Matter Particle Explorer
• The calibrations of DAMPE $\gamma$-ray effective area