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LEIA in-flight calibration confirms instrument performance

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Research area:engineering-energy

What the study found

The study found that the Lobster Eye Imager for Astronomy (LEIA), an X-ray telescope with a large field of view, performed in orbit largely as expected. Its spatial resolution, source positioning, effective area, energy response, and background behavior were characterized during two and a half years of operation.

Why the authors say this matters

The authors conclude that these instrumental performances meet the design requirements well. They also state that the work paves the way for in-orbit calibration of the Einstein Probe Wide-field X-ray Telescope (EP-WXT).

What the researchers tested

The researchers analyzed calibration observations from the Crab Nebula, Scorpius X-1, and the Cassiopeia A supernova remnant. They examined the point spread function, source positional accuracy, effective area, energy response, and instrumental background using in-flight data from LEIA.

What worked and what didn't

The spatial resolution stayed close to prelaunch values, with the elliptical point spread function focal spot ranging from 3.6′ to 9.3′ and a median of 5.9′ along the long axis. Post-calibration source positional accuracy was about 2′ at the 90% confidence level. The Crab spectra matched an absorbed power-law model well, the effective area was broadly consistent with model predictions and ground measurements, and the Cas A analysis showed the energy scale and spectral resolution were generally consistent with ground values. The effective area had a systematic uncertainty of no more than 10% at the 68% confidence level, with about a 15% decline at the lower-energy end after one year, and the instrumental background was similar across the four detectors but varied strongly with geomagnetic activity.

What to keep in mind

The abstract does not describe detailed limitations beyond noting a mild lower-energy deterioration in effective area after one year of operation. The summary is limited to the calibration sources and performance measures reported in the abstract.

Key points

  • LEIA’s in-orbit spatial resolution remained close to prelaunch values.
  • Source positional accuracy after calibration was about 2′ at 90% confidence.
  • Crab observations supported an effective area consistent with predictions and ground measurements.
  • The effective area showed up to 10% systematic uncertainty and about 15% lower-energy deterioration after one year.
  • Instrumental background was similar across detectors and strongly affected by geomagnetic activity.

Disclosure

Research title:
LEIA in-flight calibration confirms instrument performance
Authors:
Huaqing Cheng, Haiwu Pan, Yuan Liu, J. Y. Hu, Haonan Yang, Donghua Zhao, Zhixing Ling, He‐Yang Liu, Yifan Chen, Xiaojin Sun, Longhui Li, Ge Jin, Chen Zhang, Shuang‐Nan Zhang, Weimin Yuan
Institutions:
Astronomy and Space, Astronomy and Space, Astronomy and Space, Astronomy and Space, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Institute of High Energy Physics, National Astronomical Observatories, National Astronomical Observatories, National Astronomical Observatories, National Astronomical Observatories, National Astronomical Observatories, National Astronomical Observatories, National Astronomical Observatories, National Astronomical Observatories, National Astronomical Observatories, National Astronomical Observatories, Shanghai Institute of Technical Physics, Shanghai Institute of Technical Physics, University of Chinese Academy of Sciences, University of Chinese Academy of Sciences, University of Chinese Academy of Sciences, University of Chinese Academy of Sciences, US Night Vision (United States), US Night Vision (United States)
Publication date:
2026-04-27
DOI:
10.1051/0004-6361/202556050
OpenAlex record:
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AI provenance: This post was generated by gpt-5.4-mini (OpenAI). The original authors did not write or review this post.

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