The influence of ultra-high-energy cosmic rays on star formation in the early universe

Details The influence of ultra-high-energy cosmic rays on star formation in the early universe The influence of ultra-high-energy cosmic rays on star formation in the early universe

2006-09-18

arxiv.org/abs/astro-ph/0609486v1

Astron.Rep.50:778-784,2006; PismaAstron.Zh.83:872-879,2006

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures

Scientific paper

10.1134/S1063772906100027

The presence of ultra-high-energy cosmic rays (UHECR) results in an increase in the degree of ionization in the post-recombination Universe, which stimulates the efficiency of the production of H$_2$ molecules and the formation of the first stellar objects. As a result, the onset of the formation of the first stars is shifted to higher redshifts, and the masses of the first stellar systems decrease. As a consequence, a sufficient increase in the ionizing radiation providing the reionization of the Universe can take place. We discuss possible observational manifestations of these effects and their dependence on the parameters of UHECR.

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