Space-time distributions of QSO absorption systems

Details Space-time distributions of QSO absorption systems Space-time distributions of QSO absorption systems

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...358....1k&link_type=abstract

Astronomy and Astrophysics, v.358, p.1-12 (2000)

Astronomy and Astrophysics

Astrophysics

11

Galaxies: Quasars: Absorption Lines, Cosmology: Large-Scale Structure Of Universe

Scientific paper

A statistical analysis of the distributions of C IV and Mg II absorption-line systems observed in quasar spectra within the cosmological redshift interval z=0.2-3.2 is presented. The results indicate that the overall z-distribution of absorbing matter is non-uniform: it has statistically significant maxima and minima, but it appears statistically isotropic. The maxima in the z-distribution of absorption systems are found at z_m = 0.44, 0.77, 1.04, 1.30, 1.46, 1.60, 1.78, 1.98, 2.14, 2.45, 2.64, and 2.86 (+/- 0.04). The positions of maxima and minima of the z-distribution turn out to be the same (within the statistical uncertainty) for different celestial hemispheres independently of their orientation. The resulting space-time distribution of absorbing matter resembles successively embedded spheres corresponding to the z_m values indicated. The most probable origin of such a distribution is an alternation of pronounced and depressed epochs in the course of cosmological evolution.

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