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- W4380136041 abstract "Context. Whereas X-ray clusters are extensively used for cosmology, their idealistic modelling, through the hypotheses of spherical symmetry and hydrostatic equilibrium, are more and more being questioned. Along these lines, the soft X-ray emission detected in tens of clusters with ROSAT was found to be higher than what expected from the idealistic hot gas modelling, pointing to our incomplete understanding of these objects. Aims. Given that cluster environments are at the interface between the hot intra-cluster medium (ICM), warm circum-galactic medium (WCGM) and warm-hot intergalactic medium (WHIM), we aim to explore the relative soft X-ray emission of different gas phases in circum-cluster environments. Method. By using the most massive halos in IllustrisTNG at z=0, we have predicted the hydrodynamical properties of the gas from cluster centers to their outskirts (5 R200), and modelled their X-ray radiation for various plasma phases. Results. First, we found that the radial profile of temperature, density, metallicity and clumpiness of the ICM are in good agreement with recent X-ray observations of clusters. Secondly, we have developed a method to predict the radial profile of soft X-ray emission in different bands, the column density of ions and the X-ray absorption lines (O VIII, O VII, Ne IX, and Ne IX) of warm-hot gas inside and around clusters. Conclusion. The warm gas (in the form of both WCGM and WHIM gas) is a strong emitter in soft X-ray bands, and is qualitatively consistent with the observational measurements. Our results suggest that the cluster soft excess is induced by the thermal emission of warm gas in the circum-cluster environments." @default.
- W4380136041 created "2023-06-10" @default.
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- W4380136041 date "2023-06-07" @default.
- W4380136041 modified "2023-09-24" @default.
- W4380136041 title "Soft X-ray emission from warm gas in IllustrisTNG circum-cluster environments" @default.
- W4380136041 doi "https://doi.org/10.48550/arxiv.2306.04694" @default.
- W4380136041 hasPublicationYear "2023" @default.
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