Optimized UV and X-ray Background Source Samples for WHIM Detection

Mathematics – Logic

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Agn Evolution

Scientific paper

Cosmological simulations imply that 50% of the baryonic matter in the Local Universe (z≤0.5) resides in a filamentary Warm-Hot Intergalactic Medium (WHIM). The WHIM filaments are intrinsically difficult to detect. The search for observational evidence for the WHIM has only produced statistically limited and/or highly controversial results. The most promising approach to detect and study the WHIM is to search for absorption features from the WHIM in both X-ray and Far UV in the spectra of bright background AGNs. However, extremely long observations with major observatories (Hubble, Chandra, XMM) are required. This investment requires that target selection be carefully optimized. Here we present the results of a search for optimal targets in the UV and X-ray bands. We establish that there is one extremely bright target and a smaller sample of 17 sources practical to use for WHIM studies with current X-ray and FUV spectrographs and deeper WHIM studies with future X-ray facilities (IXO, Pharos).

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