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Title:
C IV absorption in a new sample of 55 QSOs - Evolution and clustering of the heavy-element absorption redshifts
Authors:
Sargent, Wallace L. W.; Boksenberg, A.; Steidel, Charles C.;
Affiliation:
AA(Palomar Observatory, Pasadena, CA), AB(Royal Greenwich Observatory, Herstmonceux, England), AC(Palomar Observatory, Pasadena, CA)
Publication:
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 68, Dec. 1988, p. 539-641. SERC-supported research. (ApJS Homepage)
Publication Date:
12/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Absorption Spectra, Galactic Clusters, Galactic Evolution, Heavy Elements, Quasars, Red Shift, Intergalactic Media, Line Spectra, Lyman Alpha Radiation, Signal To Noise Ratios
DOI:
10.1086/191300
Bibliographic Code:
1988ApJS...68..539S

Abstract

A homogeneous sample of 55 QSOs with z(em) between 1.8 and 3.54 was prepared in order to study the statistics of the C IV 1548, 1550 absorption redshifts, and the results are reported. No significant tendency is found for the absorption redshifts to cluster around the emission redshift of the QSOs regardless of the radio properties of the QSO. An application of the Bahcall-Peebles test shows that the large-scale distribution of redshifts along the line of sight is consistent with that expected based on the intervening hypothesis for the origin of the lines. The number density of absorption systems per unit redshift range decreases with increasing redshift in the z(abs) range between 1.3 and 3.4 according to a given relation. There is a systematic change in the mean C IV doublet ratio with redshift. There is no significant correlation between the number of absorbers in the line of sight to a given QSO and its intrinsic luminosity.

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