The calibrations of DAMPE $γ$-ray effective area
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866916478957125632 |
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| author | Shen, Zhao-Qiang Li, Wen-Hao Duan, Kai-Kai Jiang, Wei Xu, Zun-Lei Yue, Chuan Li, Xiang |
| author_facet | Shen, Zhao-Qiang Li, Wen-Hao Duan, Kai-Kai Jiang, Wei Xu, Zun-Lei Yue, Chuan Li, Xiang |
| contents | The DArk Matter Particle Explorer (DAMPE) is a cosmic-ray detector as well as a pair-converting $γ$-ray telescope. The effective area, reflecting the geometrical cross-section area, the $γ$-ray conversion probability and the photon selection efficiency, is important in the $γ$-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 $γ$-ray analysis toolkit DmpST. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_02161 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The calibrations of DAMPE $γ$-ray effective area Shen, Zhao-Qiang Li, Wen-Hao Duan, Kai-Kai Jiang, Wei Xu, Zun-Lei Yue, Chuan Li, Xiang Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena Instrumentation and Detectors The DArk Matter Particle Explorer (DAMPE) is a cosmic-ray detector as well as a pair-converting $γ$-ray telescope. The effective area, reflecting the geometrical cross-section area, the $γ$-ray conversion probability and the photon selection efficiency, is important in the $γ$-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 $γ$-ray analysis toolkit DmpST. |
| title | The calibrations of DAMPE $γ$-ray effective area |
| topic | Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena Instrumentation and Detectors |
| url | https://arxiv.org/abs/2410.02161 |