The redshift evolution of the Lyman-alpha forest - Blending effects

Details The redshift evolution of the Lyman-alpha forest - Blending effects The redshift evolution of the Lyman-alpha forest - Blending effects

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...398..491t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 398, no. 2, p. 491-494.

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Galactic Evolution, Lyman Alpha Radiation, Red Shift, Absorption Spectra, Astronomical Spectroscopy, Computational Astrophysics, Spectral Line Width

Scientific paper

The determination of intrinsic properties and the evolution of the Lyman-alpha absorption lines in the spectra of high-redshift quasars can be severely affected by line blending in medium-dispersion spectroscopic data. We compare simulated spectra with real data showing how line blending can produce an apparent dependence of the number density evolutionary parameter gamma of the absorption lines on their equivalent widths, stronger lines evolving faster with redshift. An intrinsic dependence of gamma on W of the opposite sign, recently found at high resolution, appears consistent with medium-dispersion data. This type of evolution could partly account for the excess of absorption found at redshift greater than 4.

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