An algorithm to resolve γ-rays from charged cosmic rays with DAMPE

Abstract

The DArk Matter Particle Explorer (DAMPE), also known as Wukong in China, launched on December 17, 2015, is a new high energy cosmic ray and γ-ray satellite-borne observatory in space. One of the main scientific goals of DAMPE is to observe GeV-TeV high energy γ-rays with accurate energy, angular, and time resolution, to indirectly search for dark matter particles and for the study of high energy astrophysics. Due to the comparatively higher fluxes of charged cosmic rays with respect to γ-rays, it is challenging to identify γ-rays with sufficiently high efficiency minimizing the amount of charged cosmic ray contamination. In this work we present a method to identify γ-rays in DAMPE data based on Monte Carlo simulations, using the powerful electromagnetic/hadronic shower discrimination provided by the calorimeter and the veto detection of charged particles provided by the plastic scintillation detector. Monte Carlo simulations show that after this selection the number of electrons and protons that contaminate the selected γ-ray events at $\sim 10$ GeV amounts to less than 1% of the selected sample. Finally, we use flight data to verify the effectiveness of the method by highlighting known γ-ray sources in the sky and by reconstructing preliminary light curves of the Geminga pulsar.

arXiv comment15 pages,16 figures

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• Observations of Forbush Decreases of cosmic ray electrons and positrons with the Dark Matter Particle Explorer
• A Method of Alignment of the Plastic Scintillator Detector of DAMPE
• Correction Method for the Readout Saturation of the DAMPE Calorimeter
• DmpIRFs and DmpST: DAMPE Instrument Response Functions and Science Tools for Gamma-Ray Data Analysis
• Search for gamma-ray line signals around the black hole at the galactic center with DAMPE observation
• Searching Accretion-Enhanced Dark Matter Annihilation Signals in the Galactic Centre
• A radiative neutrino mass model in light of DAMPE excess with hidden gauged $U(1)$ symmetry
• Boresight Alignment of DArk Matter Particle Explorer
• PSF Calibration of DAMPE for gamma-ray Observations
• Observations of the Fermi bubbles and the Galactic center excess with the DArk Matter Particle Explorer
• Energy correction based on fluorescence attenuation of DAMPE
• The calibrations of DAMPE $\gamma$-ray effective area
• A Study on Monte Carlo simulation of the radiation environment above GeV at the DAMPE orbit