Evolution And X-ray Emission Of The Whim

Details Evolution And X-ray Emission Of The Whim Evolution And X-ray Emission Of The Whim

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0735g&link_type=abstract

American Astronomical Society, HEAD meeting #9, #7.35; Bulletin of the American Astronomical Society, Vol. 38, p.355

Astronomy and Astrophysics

Astronomy

Scientific paper

The number of detected baryons in the Universe at z<0.5 is much smaller than predicted by standard detailed observation of the Lyman alpha forest at red-shift z=2, the result from the WMAP experiment, and the observation of the light element ratio combined with standard nucleosynthesis. Hydrodynamical simulations indicate that a large fraction of the baryons today is expected to be in a ''warm-hot'' filamentary gas, distributed in the intergalactic medium (WHIM) and some experimental result provides scant evidence its existance. However, very little is known about the properties of this gas, and its own existence, while commonly accepted, it is not fully proven. It is currently believed that a significant fraction of the diffuse x-ray background below 1 keV may be due to thermal emission from the WHIM. Its signature should be observable in red-shifted soft x-ray emission and absorption lines from highly ionized elements. Several dedicated missions for the study of the WHIM are on the drawing board in the US, Europe, and Japan.
Based on the output of a large scale hydrodynamic SPH simulation (Borgani et al., 2004, MNRAS, 348, 1078) we have studied the behavior of the baryons in the WHIM. Using the properties of the SPH simulation and the large number of snapshots saved as output, we have been able to characterize in detail the evolution of the individual particles in the simulation and their properties (density, temperature, entropy, and metallicity) as a function of redishift.
We also used the output of the hydrodynamic simulation to characterize the WHIM emission in the soft X-ray band. This gives us a much clearer picture of the characteristics necessary for a dedicated mission to detect and study it.

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