Mathematics – Logic
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980rspta.296..399w&link_type=abstract
(Royal Society, Discussion on the Origin and Early Evolution of the Galaxies, London, England, Feb. 14, 15, 1979.) Royal Society
Mathematics
Logic
2
Absorption Spectra, Astronomical Spectroscopy, Intergalactic Media, Interstellar Gas, Quasars, Cosmology, Lyman Alpha Radiation, Metals, Red Shift
Scientific paper
The properties of the clouds producing Ly alpha absorption and C IV absorption in the spectra of quasars are reviewed. The C IV-producing clouds may be classified into three groups representing ejection, clouds moving in a cluster containing the quasar itself, and intervening material at cosmological distances. The incidence of the latter type imply effective radii for luminous galaxies of order 100 kpc, and a present-epoch mean free path of ca. 10 Gpc. No decisive evidence yet exists about whether most of the Ly alpha producing clouds arise in truly primordial hydrogen clouds as opposed to metal-enriched material associated with galaxies. In the latter interpretation, the line density is such that the mean free paths are 100 times smaller and the effective galaxy radii 10 times larger than for C IV.
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