Intergalactic Medium in the ΛCDM Universe from Cosmological Simulations

Details Intergalactic Medium in the ΛCDM Universe from Cosmological Simulations Intergalactic Medium in the ΛCDM Universe from Cosmological Simulations

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jkas...38..129f&link_type=abstract

Journal of the Korean Astronomical Society, vol. 38, no. 2, pp. 129-132

Mathematics

Logic

Cosmology: Theory, Intergalactic Medium, Large-Scale Structure Of The Universe, Methods: Numerical

Scientific paper

The temperature (T) and entropy (S) fields of baryonic gas, or intergalactic medium (IGM), in the ΛCDM cosmology are analyzed using simulation samples produced by a hybrid cosmological hydrodynamic/N-body code based on the weighted essentially non-oscillatory scheme. We demonstrate that , in the nonlinear regime, the dynamical similarity between the IGM and dark matter will be broken in the presence of strong shocks in the IGM. The heating and entropy production by the shocks breaks the IGM into multiple phases. The multiphase and non-Gaussianity of the IGM field would be helpful to account for the high-temperature and high-entropy gas observed in groups and clusters with low-temperature IGM observed by Lyα forest lines and the intermittency observed by the spikes of quasi-stellar object's absorption spectrum.

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