Abstract
view Abstract Citations (6) References (82) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Analysis of C IV Absorption Lines from Clouds at High Redshifts Peng, Wei ; Weisheit, Jon C. Abstract From a theoretical study of published QSO spectra, we conclude that the Lyman-α forest lines and the most prevalent metal-line systems (those optically thin at the Lyman limit) arise in very different absorber populations. We found for these systems that the observed increase with redshift of the C IV λλ1548, 1550 doublet ratio can be explained as being due to slowly changing metagalactic ionization conditions; there is no need to invoke any cosmic chemical evolution, We also found no correlation between equivalent widths of Lyα and C IV lines having the same absorption redshift, and consequently we suggest 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 δv ~ few hundred km s^-1^, are proto-globular clusters is explored in some detail. Publication: The Astrophysical Journal Pub Date: June 1991 DOI: 10.1086/170067 Bibcode: 1991ApJ...373..471P Keywords: Absorption Spectra; Carbon; Globular Clusters; Lyman Alpha Radiation; Quasars; Red Shift; Astronomical Models; Astronomical Spectroscopy; Star Clusters; Astrophysics; CLUSTERS: GLOBULAR; QUASARS full text sources ADS |
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