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Multiband Weighting of X-Ray Polarization Data

Marshall, Herman L.

The Astrophysical journal, 2021-02, Vol.907 (2), p.82 [Periódico revisado por pares]

Philadelphia: The American Astronomical Society

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  • Título:
    Multiband Weighting of X-Ray Polarization Data
  • Autor: Marshall, Herman L.
  • Assuntos: Astronomical polarimetry ; Astronomy ; Astronomy data analysis ; High energy astrophysics ; Modulation ; Neural networks ; Parameter estimation ; Polarimetry ; Polarization ; Response functions ; Stokes parameters ; X ray astronomy ; X ray imagery
  • É parte de: The Astrophysical journal, 2021-02, Vol.907 (2), p.82
  • Notas: AAS26705
    Laboratory Astrophysics, Instrumentation, Software, and Data
  • Descrição: An optimal estimate for Stokes parameters is derived for the situation in X-ray astronomy where the instrument has a modulation factor that varies significantly with energy but the signals are very weak or mildly polarized. For such sources, the band of analysis may be broadened in order to obtain a significant polarization measurement. Optimal estimators are provided for the cases of binned and unbinned data and applied to data such as might be obtained for faint or weakly polarized sources observed using the Imaging X-ray Polarimetry Explorer. For a sample situation, the improvement in the minimum detectable polarization is 6%-7% using a count-weighted rms of the modulation factor, when compared to a count-weighted average. Improving the modulation factor, such as when using a neural network approach to Imaging X-ray Polarimetry Explorer event tracks, can provide additional improvement up to 10%-15%. The actual improvement depends on the spectral shape and the details of the instrument response functions.
  • Editor: Philadelphia: The American Astronomical Society
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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