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<p>The Pathfinder of the Type-A satellites in the Chasing All Transients Constellation Hunters (CATCH) space mission is equipped with Micro-Pore Optics (MPOs) and four single-pixel Silicon Drift Detectors (SDDs). Due to the lack of position resolution in an individual SDD, we propose a new method based on the cross-arms in the point spread function (PSF) of MPOs to enhance the satellite’s capability in identifying contaminating sources and locating target sources. By placing one detector on each of the horizontal and vertical cross-arms on the focal plane, we can use the changes in the relative counts on the cross-arms detectors to deduce the location of the source. Simulated observations demonstrate that, for a target source with a flux of 1&#xa0;Crab and an exposure time of 200&#xa0;s, the cross-arms detectors can identify contaminating source with the same flux level at an off-axis angle larger than <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({8'}\)</EquationSource> </InlineEquation>, and improve positioning accuracy to <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({6'}\)</EquationSource> </InlineEquation>. Furthermore, we extend the simulation study to CATCH Type-A, which plans to use an SDD array. In situations where sources exhibit the same flux of 1&#xa0;Crab and the exposure time is merely 1&#xa0;s, a 16<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\times\)</EquationSource> </InlineEquation>16 SDD array is capable of identifying contaminating source with an off-axis angle greater than <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({2.4'}\)</EquationSource> </InlineEquation> and can achieve a positioning precision of <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\({1.8'}\)</EquationSource> </InlineEquation>.</p>

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A new method for identifying contaminating sources and locating target sources through the cross-arm features of micro pore optics

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Yiming Huang,
  • Lian Tao,
  • Jin-Yuan Liao,
  • Shuang-Nan Zhang,
  • Stéphane Schanne,
  • Bertrand Cordier,
  • Shaolin Xiong,
  • Juan Zhang,
  • Zhengwei Li,
  • Qian-Qing Yin,
  • Xiangyang Wen,
  • Sheng Yang,
  • Min Gao,
  • Donghua Zhao,
  • Xiang Ma,
  • Yue Huang,
  • Liang Zhang,
  • Liming Song

摘要

The Pathfinder of the Type-A satellites in the Chasing All Transients Constellation Hunters (CATCH) space mission is equipped with Micro-Pore Optics (MPOs) and four single-pixel Silicon Drift Detectors (SDDs). Due to the lack of position resolution in an individual SDD, we propose a new method based on the cross-arms in the point spread function (PSF) of MPOs to enhance the satellite’s capability in identifying contaminating sources and locating target sources. By placing one detector on each of the horizontal and vertical cross-arms on the focal plane, we can use the changes in the relative counts on the cross-arms detectors to deduce the location of the source. Simulated observations demonstrate that, for a target source with a flux of 1 Crab and an exposure time of 200 s, the cross-arms detectors can identify contaminating source with the same flux level at an off-axis angle larger than \({8'}\) , and improve positioning accuracy to \({6'}\) . Furthermore, we extend the simulation study to CATCH Type-A, which plans to use an SDD array. In situations where sources exhibit the same flux of 1 Crab and the exposure time is merely 1 s, a 16 \(\times\) 16 SDD array is capable of identifying contaminating source with an off-axis angle greater than \({2.4'}\) and can achieve a positioning precision of \({1.8'}\) .