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Confirmation of the Friedmann‐Lemaǐtre universe by the distribution of the larger absorbing clouds
Author(s) -
Hoell J.,
Liebscher D.E.,
Priester W.
Publication year - 1994
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2103150202
Subject(s) - physics , friedmann equations , redshift , universe , limit (mathematics) , astrophysics , metric expansion of space , mathematical physics , cosmology , theoretical physics , dark energy , mathematics , galaxy , mathematical analysis
A new theoretical approach is applied to the cloud model as an explanation for the Lyman α forest. It is based on the complete Friedmann equations including a Λ‐term. In the data sets of Lu et al. 1991 and Röser 1993 the lines are constrained by a lower limit (0.36 Å, 0.32 Å) 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‐Lemaǐtre model with λ 0 = 1.08 ± 0.02 and ω 0 = 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. H 0 −1 . It is not necessary to invoke any evolutionary effects in the number densities and in the physical parameters of the clouds.