Orateur
Description
With its 5 eV resolution (a factor >20 compared to CCD spectrometers), the Resolve instrument onboard XRISM marks the beginning of the high-resolution X-ray spectroscopy era. This achievement is particularly transformative for extended sources, where the non-dispersive characteristics of Resolve (and future micro-calorimeters such as NewAthena/X-IFU) allow for the first time to probe the dynamics of astrophysical plasmas such as supernova remnants and clusters of galaxies. In practice, however, the analysis of extended sources with Resolve is rendered challenging because the large point spread function (PSF, ~1.3 arcmin) of the telescopes mixes photons (thus spectral information) coming from different regions of the sky. In this talk, we discuss this "spatial-spectral mixing" challenge and concrete methods to mitigate it. We conclude by addressing future prospects such as extended source analysis expected on NewAthena/X-IFU.
