Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373..471p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 373, June 1, 1991, p. 471-481. Rice University-supported research.
Astronomy and Astrophysics
Astrophysics
6
Absorption Spectra, Carbon, Globular Clusters, Lyman Alpha Radiation, Quasars, Red Shift, Astronomical Models, Astronomical Spectroscopy, Star Clusters
Scientific paper
From a theoretical study of published QSO spectra, it is concluded that the Lyman-alpha forest lines and the most prevalent metal-line systems (those optically thin at the Lyman limit) arise in very different absorber populations. It is found for these systems that the observed increase with redshift of the C IV 1548, 1550A doublet ratio can be explained as being due to slowly changing metagalactic ionization conditions; there is no need to invoke any cosmic chemical evolution. No correlation is found between equivalent widths of Ly-alpha and C IV lines having the same absorption redshift, and consequently it is suggested that these C IV absorption-line systems arise in clouds strongly ionized by OB stars, presumably in young galaxies. The possibility that the clouds, which are known to exhibit clustering on a velocity scale of few hundred km/s, are protoglobular clusters is explored in some detail.
Peng Wei
Weisheit Jon C.
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