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Seminars

All-Moscow Seminar of Astrophysicists
(ASA)

The seminar is supported by the grant of Federal Programm "Integration"
annotation of talk
A.I.Ryabinkov, A.D.Kaminker, D.A.Varshalovich (Ioffe Inst, S.-Pb.)
"Space-time distribution of matter at the epoch Z=0.4--3.5 by analysis of absorbtion systems in QSO spectra"


A statistical analysis of distributions of C IV and Mg II absorption-line systems observed in QSO spectra within the cosmological redshift interval Zabs=0.2-3.2 is presented. The results indicate that the overall Z-distribution of matter is nonuniform, but statistically isotropic. The isotropy (or anisotropy) of the distribution is verified by comparing of independent distributions of the absorption systems in opposite hemispheres with their various orientations. There are maxima in the concentration of absorption systems at Zm= 0.44, 0.77, 1.04, 1.30, 1.46, 1.63, 1.78, 1.98, 2.14, 2.45, 2.64, and 2.86 (+/-0.04); and these values are independent of the direction of observation (within statistical uncertainty). The resulting distribution of absorption matter resembles successively embedded spheres corresponding to these Zm values. The most probable origin of this distribution is the appearance of more pronouced epochs with durations about 200-600 million years (depending on the choice of cosmological model) in the course of cosmological evolution.