The carbon abundance of the Lyman-alpha clouds

Details The carbon abundance of the Lyman-alpha clouds The carbon abundance of the Lyman-alpha clouds

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379...99l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 99-106.

Other

46

Abundance, Carbon, Intergalactic Media, Lyman Alpha Radiation, Molecular Clouds, Quasars, Absorption Spectra, Emission Spectra, Photoionization, Spectral Line Width, Spectrum Analysis

Scientific paper

A search for C IV 1548, 1550A absorption associated with Ly-alpha forest clouds is attempted, using a method similar to the composite spectrum method developed by Norris, Hartwick, and Peterson (1983). A detection of C IV 1548 absorption feature at not less than 99.99-percent significance level is tentatively reported. If confirmed, not all Ly-alpha clouds have primordial composition. Assuming that the absorption feature is real, the relative abundance of carbon of the Ly-alpha forest clouds is estimated to be roughly C/H = -3.2 from photoionization models. Some other interesting results are also discussed.

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