Abstract
Abstract We discuss the detectability of a Warm/Hot Intergalactic Medium (WHIM) via absorption lines toward bright point sources with a future X-ray satellite mission, XEUS. While we consider bright QSOs as specific examples, the methodology can be applied to bright gamma-ray burst afterglows. We created mock absorption spectra for bright QSOs (more than 20 QSOs over all sky) using the light-cone output of a cosmological hydrodynamic simulation. We assumed that the WHIM is under collisional and photo-ionization equilibrium. If WHIM has a constant metallicity of $Z = 0.1 \,Z_{ {\odot }}$, approximately 2 O VII absorption line systems with $ \gt 3 \,\sigma \gt 3 \,\sigma$ will be detected on average along a random line-of-sight toward bright QSOs up to $z=0.3$ for a 30 ks exposure.
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