Statistics – Computation
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321...69t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. 69-79.
Statistics
Computation
75
Absorption Spectra, Line Spectra, Lyman Alpha Radiation, Quasars, Red Shift, Spectral Energy Distribution, Computational Astrophysics, Cosmology, Intergalactic Media
Scientific paper
The redshift distribution of Ly-alpha absorption lines in quasar spectra is shown to be more complex than is generally believed. In addition to the systematic increase in the density of lines with z(abs), line density also increases by a similar amount as z(em) increases or equivalently as the rest-frame wavelength of the absorbed radiation decreases. There is also a significant and apparently separate lack of Ly-alpha absorption lines in QSO Ly-alpha emission lines at z(abs) = about z(em). There are several plausible causes for these effects, including serious inhomogeneities in published line samples, unidentified H2 absorption lines, photoionization by the individual observed QSOs, the failure of some Ly-alpha absorbing clouds to cover QSO emission-line regions, QSO ejecta, and large-scale (70/h100 Mpc) inhomogeneities in the universe at z = about 2.5. Previously reported estimates of the rate of evolution of the Ly-alpha systems should be considered highly suspect. It is strongly recommended that future observations of Ly-alpha lines be made only at high resolutions of about 0.15 A (10 km/s), since the lower resolutions of 1 A normally employed seem to be totally inadequate for the reliable determination of the Ly-alpha system redshift distribution.
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