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Astron. Astrophys. 358, 1-12 (2000)


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Space-time distributions of QSO absorption systems

A.D. Kaminker, A.I. Ryabinkov and D.A. Varshalovich

A.F. Ioffe Physical Technical Institute, Politekhnicheskaya 26, 194021 St.-Petersburg, Russia (kam@astro.ioffe.rssi.ru)

Received 9 August 1999 / Accepted 21 March 2000

Abstract

A statistical analysis of the distributions of C IV and Mg II absorption-line systems observed in quasar spectra within the cosmological redshift interval [FORMULA] 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 [FORMULA] 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 [FORMULA]. 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 [FORMULA] values indicated. The most probable origin of such a distribution is an alternation of pronounced and depressed epochs in the course of cosmological evolution.

Key words: galaxies: quasars: absorption lines – cosmology: large-scale structure of Universe

Send offprint requests to: A.D. Kaminker

© European Southern Observatory (ESO) 2000

Online publication: June 26, 2000

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