Mathematics – Logic
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334...22s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. 22-33. SERC-supported research.
Mathematics
Logic
86
Absorption Spectra, Magnesium, Quasars, Red Shift, Density Distribution, Metallicity, Space Density
Scientific paper
The authors present a sample of 40 Mg II absorption redshifts found in the spectra of a new, uniform sample of 55 QSOs with emission redshifts in the range 1.8 ≤ zem ≤ 3.56 published elsewhere. The Mg II redshifts lie in the range 0.24 ≤ zabs ≤ 1.46. This sample is augmented by new spectra of nine QSOs with emission redshifts in the range 0.6 ≤ zem ≤ 1.42 which yielded one Mg II absorption system. The distribution of number of absorption systems per QSO accurately follows a Poisson distribution, as is expected for randomly distributed intervening absorbers. If the results for Mg II are combined with those for C IV obtained by Sargent, Boksenberg, and Steidel, a qualitative picture emerges in which the density of absorbers increases rapidly until zabs ≡ 1, then flattens off, and finally declines beyond zabs ≡ 2.5. This is interpreted as being due to the combined effects of cosmological expansion and the chemical evolution of the absorbers.
Boksenberg Alec
Sargent Wallace L. W.
Steidel Charles C.
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