Confirmation of the Friedmann-Lemaitre universe by the distribution of the larger absorbing clouds

Astronomy and Astrophysics – Astronomy

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Absorption Spectra, Astronomical Models, Hydrogen Clouds, Lyman Alpha Radiation, Universe, Hubble Constant, Mass Distribution, Quasars, Red Shift

Scientific paper

A new theoretical approach is applied to the cloud model as an explanation for the Lyman alpha forest. It is based on the complete Friedmann equations including a Lambda-term. In the data sets of Lu et al. 1991 and Roeser 1993 the lines are constrained by a lower limit (0.36 A, 0.32 A) of the intrinsic equivalent width. This makes them suitable for a cloud model analysis, supplementing the bubble wall models which also make use of the weaker lines. Both data sets can be represented satisfactorily by a Friedmann-Lemaitre model with lambda0 = 1.08 +/- 0.02 and Omega0 = 0.014 +/- 0.006, although the regression formulae differ by an essential factor depending on the redshift. The age of the universe according to this model is 2.8 x H0 exp -1. It is not necessary to invoke any evolutionary effects in the number densities and in the physical parameters of the clouds.

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