Average Lyman absorption in high-redshift QSO spectra. II - The redshift evolution

Details Average Lyman absorption in high-redshift QSO spectra. II - The redshift evolution Average Lyman absorption in high-redshift QSO spectra. II - The redshift evolution

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.247..696g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 247, Dec. 15, 1990, p. 696-701.

Statistics

27

Lyman Spectra, Quasars, Red Shift, Ultraviolet Absorption, Astronomical Spectroscopy, Computerized Simulation, Intergalactic Media, Interstellar Extinction, Lyman Alpha Radiation, Lyman Beta Radiation

Scientific paper

The average flux decrements between Ly-alpha and Ly-beta, D(A), and between Ly-beta and the Lyman limit, D(B), have been computed from the observed spectra of seven quasars. These new data increase the statistical information about the redshift distribution of hydrogen intergalactic absorbers. All the available data are compared with simulations of the average absorptions in QSO spectra, computed mainly on the basis of the presently known statistics of the Lyman absorption lines. Discrepancies recently outlined on the evolution of the absorbers at z greater than about 4 could be reconciled including, together with the thin Lyman forest clouds, a population of damped Lyman systems whose statistical properties are being disentangled. Within the observational and statistical uncertainties there is evidence neither for a dramatic change in the evolution of the absorbers, nor for the presence of a new diffuse component of neutral hydrogen.

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