The calibrations of DAMPE \(\gamma\)-ray effective area

The DArk Matter Particle Explorer (DAMPE) is a cosmic-ray detector as well as a pair-converting \(\gamma\)-ray telescope. The effective area, reflecting the geometrical cross-section area, the \(\gamma\)-ray conversion probability and the photon selection efficiency, is important in the \(\gamma\)-r...

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Bibliographic Details
Published in:arXiv.org 2024-10
Main Authors: Zhao-Qiang, Shen, Wen-Hao, Li, Kai-Kai Duan, Jiang, Wei, Zun-Lei Xu, Yue, Chuan, Li, Xiang
Format: Article
Language:English
Subjects:
Calibration
Cosmic rays
Dark matter
Gamma rays
Pulsars
Space telescopes
Online Access:Get full text
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Summary:The DArk Matter Particle Explorer (DAMPE) is a cosmic-ray detector as well as a pair-converting \(\gamma\)-ray telescope. The effective area, reflecting the geometrical cross-section area, the \(\gamma\)-ray conversion probability and the photon selection efficiency, is important in the \(\gamma\)-ray analyses. In the work, we find a significant time variation in the effective area, as large as \(\sim -4\%/{\rm yr}\) at 2 GeV for the high-energy trigger. We derive the data-based correction factors to the effective areas and apply corrections to both the effective areas and the exposure maps. The calibrated exposure can be \(\sim 12\%\) smaller than the Monte Carlo one on average at 2 GeV. The calibration is further verified using the observation of the Vela pulsar, showing the spectral parameters with the correction are more consistent with those in the Fermi-LAT catalog than the ones without correction. All the corrections are now implemented in the latest version of the DAMPE \(\gamma\)-ray analysis toolkit DmpST.
ISSN:2331-8422
DOI:10.48550/arxiv.2410.02161