Lyman alpha evolution at high resolution - Evidence for a single population?

Details Lyman alpha evolution at high resolution - Evidence for a single population? Lyman alpha evolution at high resolution - Evidence for a single population?

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..541g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, Aug. 1, 1991, p. 541-544. Research supported by Mi

Mathematics

Logic

14

Galactic Evolution, Hydrogen Clouds, Lyman Alpha Radiation, Cosmology, H I Regions, Quasars

Scientific paper

Recent high-resolution spectroscopic data on the Lyman-alpha absorption lines allow a statistical investigation of the cosmological evolution of Ly-alpha clouds from z = 1.8 to 3.8. The maximum likelihood analysis shows that the number density evolution is differential, being progressively slower for stronger lines. There are discrepancies in the derived evolution for lines with equivalent widths W greater than 0.3 A from line samples obtained at high and intermediate resolutions. A possible explanation is given in terms of line blending. A differential evolution of this type seems to imply a unified evolutionary scheme which incorporates Ly-alpha and metal-line systems in a single population.

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