Abstract
ABSTRA C T We estimate the heating of the intergalactic medium as a result of shocks arising from structure formation. The heating of the gas outside the collapsed regions, with small overdensitiesâOnb/ nbU ! 200a is considered here, with the aid of a Zel’dovich approximation. We estimate the equation of state of this gas, relating the density to its temperature and its evolution in time, considering the shock heating caused by 1s density peaks as being the most dominant. We also estimate the mass fraction of gas above a given temperature as a function of redshift. We find that the baryon fraction above 10 6 Ka tza 0i s,10 per cent. We estimate the integrated Sunyaev‐ Zel’dovich distortion from this gas at the present epoch to be of the order of 10 26 .
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