Soft X-ray Transmission Spectroscopy of Warm/Hot Intergalactic Medium with XEUS

Abstract

We discuss the detectability of Warm/Hot Intergalactic medium (WHIM) via the 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 GRB afterglows. We create mock absorption spectra for bright QSOs (more than 20 QSOs over the all sky) using a light-cone output of a cosmological hydrodynamic simulation. We assume that WHIM is under collisional and photo-ionization equilibrium. If WHIM has a constant metallicity of $Z=0.1Z_{\odot }$, approximately 2 O{\sc vii} absorption line system with $>3\sigma$ will be detected on average along a random line-of-sight toward bright QSOs up to $z=0.3$ for 30 ksec exposure.

34 pages, 17 figures. Substantial revision. PASJ, in press (2006, vol.58, August 25 issue)

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• Equilibration processes in the Warm-Hot Intergalactic Medium
• Metal-line emission from the warm-hot intergalactic medium: I. Soft X-rays
• Studying the WHIM with Gamma Ray Bursts
• Confirming the Detection of an Intergalactic X-ray Absorber Toward PKS 2155-304
• Non-equilibrium Ionization State of Warm-Hot Intergalactic Medium
• Numerical simulations of the Warm-Hot Intergalactic Medium
• Studying the Warm-Hot Intergalactic Medium in Emission
• Filaments and sheets of the warm-hot intergalactic medium
• A detailed view of filaments and sheets in the warm-hot intergalactic medium. I. Pancake formation