Gravitational lensing and evolution in quasar absorption systems

Details Gravitational lensing and evolution in quasar absorption systems Gravitational lensing and evolution in quasar absorption systems

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...349..437t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 349, Feb. 1, 1990, p. 437-442.

Statistics

14

Absorption Spectra, Galactic Evolution, Gravitational Lenses, Quasars, Spectral Line Width, Metallicity, Red Shift

Scientific paper

Tests of both evolution and the bias due to gravitational lensing in the number density of metal absorption-line systems in quasar spectra are presented. No evidence is found for evolution except perhaps in the high eqivalent width systems, where gravitational lensing may affect the statistics. A model is proposed in which the distribution of high equivalent width systems reflects clustering of an unevolving low equivalent width population.

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