Periodicity revealed by statistics of the absorption-line redshifts of quasars

Details Periodicity revealed by statistics of the absorption-line redshifts of quasars Periodicity revealed by statistics of the absorption-line redshifts of quasars

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...329..821l&link_type=abstract

Astronomy and Astrophysics, v.329, p.821-826 (1998)

Astronomy and Astrophysics

Astrophysics

4

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

Scientific paper

We study the properties of the heavy-element absorption systems and their evolution with redshift based on the distribution of the free paths (FPs) of the light rays which come from QSOs and are intercepted by absorbers. We find that the mean free path (MFP) regularly varies with the cosmic time and has a definite periodic component, which shows a marked evolution of the absorbers. For the MFP calculated by the catalog of the absorption-line redshifts of Junkkarinen et al. (1991), an useful fitting function is overline{lambda_0(t)} ~375(t_0/t)[1 + 0.125 cos(2pit/tau)]^{-2} h^{-1Mpc}, where period tau = 1.5510(8) h(-1) yr is a result of power-spectrum analysis, t_0 = 2/(3H_0) and t = t_0(1+/line{z})(-3/2) for q_0 = 0.5. This period tau is quite consistent with the dynamic time scale of galaxies, it supports the view that the heavy-element absorption systems are due to intervening protogalaxies. The observational periodicity can be explained as an effect of oscillation of the protogalaxy after the gravitational collapse. That is to say, the heavy-element absorption systems might be due to the protogalaxies which separated from the general expansion of the universe at the cosmic time t~tau = 1.5510(8) h(-1yr) , the redshift z ~ 11, and the protogalaxies might be pulsating with the period tau at the QSO epoch.

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