Does the Lyman Limit System (LLS) evolve strongly?

Details Does the Lyman Limit System (LLS) evolve strongly? Does the Lyman Limit System (LLS) evolve strongly?

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277l...5f&link_type=abstract

Astronomy and Astrophysics, Vol. 277, p. L5 (1993)

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

Using well established statistical properties for Lyman α forest, Lyman Limit System (LLS) and the damped Lyman α system in high redshift QSOs, the computer Monte-Carlo simulated QSO spectra are constructed. The spectra are then used to calculate the average Lyman absorption D_A_ and D_B_ as a function of redshift. Both LLS models with moderate evolution suggested by Sargent et al., and with strong evolution suggested by Lanzetta are tested. The results favor the latter one, which indicates that there are much more optically thick hydrogen absorbers in the earlier epoch of the Universe.

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