Searching for the Missing Baryons in the Warm-Hot Intergalactic Medium

Details Searching for the Missing Baryons in the Warm-Hot Intergalactic Medium Searching for the Missing Baryons in the Warm-Hot Intergalactic Medium

2007-11-30

arxiv.org/abs/0711.4888v1

Astronomy and Astrophysics

Astrophysics

Proceedings of the "XMM-Newton: the next decade", to appear in Astronomische Nachrichten

Scientific paper

10.1002/asna.200710893

At low redshift (z<2), almost half of the baryons in the Universe are not found in bound structures like galaxies and clusters and therefore most likely reside in a Warm-Hot Intergalactic Medium (WHIM), as predicted by simulations. Attempts to detect WHIM filaments at cosmological distances in absorption towards bright background sources have yielded controversial results that I review here. I argue that a secure detection of absorption features by the WHIM is at the limit of the XMM-Newton capabilities, but feasible. A proper characterisation of the whole WHIM belongs to the realm of future X-ray missions.

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