Formation of the First Systems in the Wakes of Moving Cosmic Strings : Astrophysics and Relativity

概要

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Since particles receive the velocity behind moving cosmic strings, wakes are formed from dark matter and baryonic matter. These wakes will fragment into the first systems of mass M&bsine;10_7(Gμ/10^<-6>)^3(β_<st&g;γ_<st>)^3(1+z_i)^<1.5>/(1+z_f)^3M⊙, where z_i, z_f, μ, β_<st> and γ_<st> are the epoch the cosmic string traverse, the epoch the fragmentation occurs, the line density, the velocity of the strings and γ_<st>=(1-β_<st>^2)^<-1/2> in units of c=1. The shock waves in the baryonic matter appear in the wakes after the epoch z&bsine;790(Gμβ_<st>γ_<st>/10^<-6>). The baryon gas clouds may contact due to H_2 cooling after z&bsine;10^2 and Population III stars with masses of 10^<-1>〜10^2M⊙ may be fragmented within such first systems. The effects of such Population III stars on the surrounding space are briefly discussed.
理論物理学刊行会の論文
1987-05-25