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The Hot and Energetic Universe: The Wide Field Imager (WFI) for Athena+

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arxiv 1308.6785 v1 pith:CDKSMGPH submitted 2013-08-30 astro-ph.IM

A. Rau , N. Meidinger , K. Nandra , M. Porro , D. Barret , A. Santangelo , C. Schmid , L. Struder
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C. Tenzer J. Wilms C. Amoros R. Andritschke F. Aschauer A. Bahr B. Gunther M. Furmetz B. Ott E. Perinati D. Rambaud J. Reiffers J. Treis A. von Kienlin G. Weidenspointner
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The Wide Field Imager (WFI) is one of the two scientific instruments proposed for the Athena+ X-ray observatory. It will provide imaging in the 0.1-15 keV band over a wide field, simultaneously with spectrally and time-resolved photon counting. The instrument is designed to make optimal use of the grasp (collecting area times solid angle product) provided by the optical design of the Athena+ mirror system (Willingale et al. 2013), by combining a sensitive approx. 40' diameter field of view (baseline; 50' goal) DEPFET detector with a pixel size properly sampling the angular resolution of 5 arc sec on-axis (half energy width).This synthesis makes the WFI a very powerful survey instrument, significantly surpassing currently existing capabilities (Nandra et al. 2013; Aird et al. 2013). In addition, the WFI will provide unprecedented simultaneous high-time resolution and high count rate capabilities for the observation of bright sources with low pile-up and high efficiency. In this paper, we summarize the instrument design, the status of the technology development, and the baseline performance.

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Cited by 3 Pith papers

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    Replacing a 20 km Cosmic Explorer with LIGO-India at A sharp sensitivity preserves BNS localization precision in a CE40+ET network, but reduces luminosity-distance precision by roughly a third.

  3. High-statistics simulations of NewAthena WFI background using Geant4

    astro-ph.IM 2026-07 conditional novelty 4.0 of 10

    High-statistics Geant4 runs trace fluorescence background in NewAthena WFI to specific small components (bolts, light trap) and reveal a Geant4 neutron-process simulation bug.

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