Indicatives of Early Stages of Star Formation in the Universe

Abstract

The paper analyzes formation conditions for globular clusters (GCs) in circumgalactic clouds. The similarity between the metallicity distributions of GCs in the nearby Universe and of circumgalactic clouds is substantiated in detail over a wide range of redshifts: from \mbox{0.2} to \mbox{5.9}. The distributions of the number of circumgalactic clouds and GCs both contain a sequence of four local maxima at the metallicity values: \mbox{$[X/H]\simeq -2.6,-2.0,-1.4,-0.5$}. The sequential enrichment of a circumgalactic cloud with a mass of $10^8{M}_{\odot }$ is calculated starting the extremely low metallicity \mbox{$[X/H]<-2.3$}, then following through the stages of \mbox{$-2.3\le [X/H]<-1.7$} and \mbox{$-1.7\le [X/H]<-0.9$} to the high metallicity \mbox{$[X/H]\ge -0.9$}, where the boundaries of these ranges coincide with the local minima of the number of objects in the distributions. It is shown that for the reproduction of such distributions, it is sufficient that at each stage of enrichment of a part of a cloud in metals, one or more GCs with a total mass of \mbox{$3\times 10^6{M}_{\odot }$} are formed. It is shown that the maximum mass of stars capable of leading to supernova explosions increases with the increase of metallicity. Possible values of this mass are calculated for the metallicities corresponding to the maxima in the distributions of clouds and GCs.

13 pages, 4 figures, published in Astrofizicheskii Byulleten

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