The redshift distribution of the Lyman-α forest clouds revisited.

Details The redshift distribution of the Lyman-α forest clouds revisited. The redshift distribution of the Lyman-α forest clouds revisited.

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...299..641r&link_type=abstract

Astronomy and Astrophysics, v.299, p.641

Astronomy and Astrophysics

Astrophysics

4

Quasars: Absorption Lines, Cosmology: Observations

Scientific paper

To study the evolution of the absorbing clouds in the so-called Lyman forest in the spectra of high redshift QSOs, a sample of 50 well studied objects is collected from the literature together with some new data. The statistical analysis of the redshift distribution of the Lyman-α lines supports a strong increase of the line densities at high redshifts (if dN/dz {prop.to}(1+z)gamma^, γ=2.44+/-0.24). In addition, a flattening in the line distribution is indicated at the lowest redshifts accessible from the ground (z<2.3), consistent with recent HST observations. If at all, there is only a very weak indication of the so-called inverse effect, attributed to the Stroemgren sphere of the QSO under study. A behaviour similar to this effect may be generated by a flattening of the distribution of Lyman-lines at low redshifts.

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