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Reveals the presence of cold gas in galaxy clusters, indicating a multiphase intracluster medium.
The discovery of EUV and soft X-ray excess emission in clusters of galaxies (the cluster soft-excess phenomenon) challenged the notion of the hot (\~ 10⁷⁻⁸ K) gas as the only dominant thermal component of the intracluster medium (ICM). The spatial analysis of ROSAT PSPC 1/4 keV images presented here reveals compelling evidence for substantial amounts of cold gas (HI) in the ICM of the Coma and Virgo clusters. This finding bolsters the original interpretation of the soft excess as emission from a `warm' (\~ 10⁶ K) gas and points to the scenario of a multiphase ICM where the hot component co-exists with gases at sub-Virial temperatures (the `warm' and `cold' phases).
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Bonamente et al. (2001) studied this question.
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