Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994an....315...89h&link_type=abstract
Astronomische Nachrichten (ISSN 0004-6337), vol. 315, no. 2, p. 89-96
Astronomy and Astrophysics
Astronomy
7
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.
Hoell Josef
Liebscher Dierck Ekkehard
Priester Wolfgang
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