An inhomogeneous reference catalogue of identified intervening heavy element systems in spectra of QSOs

Details An inhomogeneous reference catalogue of identified intervening heavy element systems in spectra of QSOs An inhomogeneous reference catalogue of identified intervening heavy element systems in spectra of QSOs

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250...24y&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, May 1, 1991, p. 24-49. University of Chicago-suppo

Astronomy and Astrophysics

Astronomy

51

Astronomical Catalogs, Cosmochemistry, Interstellar Matter, Line Spectra, Quasars, Spectrum Analysis, Carbon, Forbidden Transitions, Heavy Elements, Red Shift, Silicon

Scientific paper

Identifications of heavy element line systems, observed in spectra of quasi-stellar objects between 1965 and 1989 inclusive, are collected and tabulated with references. Each system is assigned a quality grade based on the apparent reliability of the data. The highest quality systems are used to characterize the absorbers as a sample. A decrease in C IV line strength with redshift (z), and the corresponding decrease in line density per unit z with z are confirmed. The weakest C IV systems, at high z, are accompanied by relatively stronger Si IV lines, compared to the relative line strengths at low z. The space density of systems with strong lines of first ions is nearly independent of z below z = 3, though it drops at z greater than 3. Preliminary tests for quasar lensing by intervening systems and for clustering of absorbers on large scales are presented.

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