Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996arep...40..451g&link_type=abstract
Astronomy Reports, Volume 40, Issue 4, July 1996, pp.451-457
Astronomy and Astrophysics
Astronomy
Scientific paper
The evolution of the system of Lalpha_ forest clouds is examined under the supposition that a determining factor is the merging of clouds in inelastic collisions, and that the clouds thus formed become galaxies when their mass reaches a certain critical value. A simple model of spherical homogeneous (in density) clouds is used. The mass distribution n_c_(m, t) (mass spectrum) of the clouds as a function of time is obtained through numerical solution of the Smolukhovskii equation. This distribution proves to be asymptotically self-similar, independent of the initial conditions (for t = t_0_ > 0), i.e., n_c_(m, t_1_) is proportional to n_c_(m,t_2_) if t_1_, t_2_ > t_0_. The total number of clouds along the line of sight varies with redshift as n_tot_ is proportional to (1+z)gamma^, where γ ~ 2 (for z >~ 1). This value of γ corresponds to that observed. Thus, we conclude that dwarf galaxies can form in the process of evolution of the system of Lalpha_ forest clouds. Some questions regarding the structure of the clouds and their interactions are briefly discussed.
Gorbatskii V. G.
Kirienko A. B.
Prokhorov S. P.
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