The defocused observations of bright sources with Athena/X-IFU

@article{Kammoun2022TheDO,
  title={The defocused observations of bright sources with Athena/X-IFU},
  author={Elias S. Kammoun and Didier Barret and Phillipe Peille and Richard Willingale and Thomas Dauser and J{\"o}rn Wilms and Matteo Guainazzi and J. M. Miller},
  journal={Astronomy \& Astrophysics},
  year={2022}
}
Context. The X-ray Integral Field Unit (X-IFU) is the high resolution X-ray spectrometer of ESA’s Athena X-ray observatory. It will deliver X-ray data in the 0 . 2 − 12 keV band with an unprecedented spectral resolution of 2.5 eV up to 7 keV. During the observation of very bright X-ray sources the X-IFU detectors will receive high photon rates. The count rate capability of the X-IFU will be improved by using the defocusing option, which will enable the observations of extremely bright sources… 
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