Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-02-04
Astronomy and Astrophysics
Astrophysics
LaTeX, 10 pages, 2 figures, final version to be published in the ApJ
Scientific paper
10.1086/312022
High-resolution hydrodynamics simulations of the Ly-alpha forest in cold dark matter dominated cosmologies appear to predict line widths that are substantially narrower than those observed. Here we point out that Compton heating of the intergalactic gas by the hard X-ray background (XRB), an effect neglected in all previous investigations, may help to resolve this discrepancy. The rate of gain in thermal energy by Compton scattering will dominate over the energy input from hydrogen photoionization if the XRB energy density is 0.2x/
Efstathiou George
Madau Piero
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