The Calibrations of the DAMPE γ-Ray Effective Area
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 γ -ray analyses. In this work,...
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| Veröffentlicht in: | The Astrophysical journal 2024-11, Vol.976 (1), p.53 |
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| creator | Shen, Zhao-Qiang Li, Wen-Hao Duan, Kai-Kai Jiang, Wei Xu, Zun-Lei Yue, Chuan Li, Xiang |
| description | 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
γ
-ray analyses. In this work, we find a significant time variation in the effective area, as large as ∼−4% yr
−1
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 ∼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
. |
| doi_str_mv | 10.3847/1538-4357/ad834b |
| format | Article |
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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
γ
-ray analyses. In this work, we find a significant time variation in the effective area, as large as ∼−4% yr
−1
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 ∼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
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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
γ
-ray analyses. In this work, we find a significant time variation in the effective area, as large as ∼−4% yr
−1
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 ∼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
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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
γ
-ray analyses. In this work, we find a significant time variation in the effective area, as large as ∼−4% yr
−1
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 ∼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
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| subjects | Calibration Cosmic rays Dark matter Gamma ray telescopes Pulsars Space telescopes |
| title | The Calibrations of the DAMPE γ-Ray Effective Area |
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