Redshift distribution of Lyα lines and metal systems

Authors

  • M. Demiański,

    1. Institute of Theoretical Physics, University of Warsaw, 00–681 Warsaw, Poland
    2. Department of Astronomy, Williams College, Williamstown, MA 01267, USA
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  • A. G. Doroshkevich,

    Corresponding author
    1. Theoretical Astrophysics Center, Juliane Maries Vej 30, DK–2100 Copenhagen Ø, Denmark
    2. Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, 125047 Moscow, Russia
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  • V. Turchaninov

    1. Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, 125047 Moscow, Russia
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★ E-mail: dorr@tac.dk

Abstract

The observed redshift distribution of Lyα lines and metal systems is examined in order to discriminate and to trace the evolution of structure elements observed in the galaxy distribution, at small redshifts, and to test the theoretical description of structure evolution. We show that the expected evolution of a filamentary component of structure describes quite well the redshift distribution of metal systems and stronger Lyα lines with log(Ni)geqslant R: gt-or-equal, slanted14, at zleqslant R: less-than-or-eq, slant3. The redshift distribution of weaker Lyα lines can be attributed to the population of poorer structure elements (Zel'dovich pancakes), which were formed at high redshifts from the invisible dark matter and non-luminous baryonic matter, and which at lower redshifts are mainly merged and dispersed.

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