The distribution of Lyman-alpha absorption lines in high-redshift QSOs - The case for evolution reexamined

Details The distribution of Lyman-alpha absorption lines in high-redshift QSOs - The case for evolution reexamined The distribution of Lyman-alpha absorption lines in high-redshift QSOs - The case for evolution reexamined

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..527h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 527-531.

Statistics

Computation

21

Absorption Spectra, Cosmology, Intergalactic Media, Lyman Alpha Radiation, Quasars, Red Shift, Computational Astrophysics, Hydrogen Clouds, Line Spectra

Scientific paper

In the light of recent criticism, the evidence for evolution in the number density dN/dz of Ly-alpha forest absorption lines over the redshift range 1.5-3.78 is reexamined. On the basis of a two-parameter fit to dN/dz for a homogeneous sample of QSOs, both the existence of strong global evolution in line density with redshift and the presence of a countervailing trend within individual QSOs (the 'inverse effect') are confirmed. A former conclusion that the inverse effect is only significant when absorption lines close to Ly-alpha emission are included in the sample is also confirmed. If the inverse effect is due principally to increased ionization of Ly-alpha clouds in the vicinity of each QSO, it may be possible (with large samples of QSOs covering a wider range in redshift and luminosity) to use this effect to determine directly the intensity of the UV background as a function of epoch.

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