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Sökning: WFRF:(Taverna Roberto)

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1.
  • Soffitta, Paolo, et al. (författare)
  • A polarized view of the hot and violent universe
  • 2021
  • Ingår i: Experimental astronomy. - : Springer Nature. - 0922-6435 .- 1572-9508. ; 51:3, s. 1109-1141
  • Tidskriftsartikel (refereegranskat)abstract
    • X-ray polarimetry has long been considered the 'holy grail' of X-ray astronomy. Fortunately, after a silence of more than 40 years, the field is now rejuvenating. In fact, an X-ray polarimeter onboard a Cube-sat nano-satellite has been recently successfully operated. IXPE, the Imaging X-ray Polarimetry Explorer, will be launched in 2021 while eXTP, containing a larger version of IXPE, is expected to be launched in 2027. Although at present it is difficult to predict the discoveries that, given their exploratory nature, IXPE and eXTP will obtain, the path for a follow-up mission can already be envisaged. In this paper we describe the scientific goals of such a follow-up mission, and present a medium-size mission profile that can accomplish this task.
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2.
  • Svoboda, Jiří, et al. (författare)
  • Dramatic Drop in the X-Ray Polarization of Swift J1727.8–1613 in the Soft Spectral State
  • 2024
  • Ingår i: Astrophysical Journal Letters. - 2041-8205 .- 2041-8213. ; 966:2
  • Tidskriftsartikel (refereegranskat)abstract
    • Black hole X-ray binaries exhibit different spectral and timing properties in different accretion states. The X-ray outburst of a recently discovered and extraordinarily bright source, Swift J1727.8–1613, has enabled the first investigation of how the X-ray polarization properties of a source evolve with spectral state. The 2–8 keV polarization degree was previously measured by the Imaging X-ray Polarimetry Explorer (IXPE) to be ≈4% in the hard and hard intermediate states. Here we present new IXPE results taken in the soft state, with the X-ray flux dominated by the thermal accretion disk emission. We find that the polarization degree has dropped dramatically to ≲1%. This result indicates that the measured X-ray polarization is largely sensitive to the accretion state and the polarization fraction is significantly higher in the hard state when the X-ray emission is dominated by upscattered radiation in the X-ray corona. The combined polarization measurements in the soft and hard states disfavor a very high or low inclination of the system.
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