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- W2993508563 abstract "We explore the implications of a possible cosmic-ray (CR) background generated during the first supernova explosions that end the brief lives of massive Population III stars. We show that such a CR background could have significantly influenced the cooling and collapse of primordial gas clouds in minihaloes around redshifts of z ∼15-20, provided the CR flux was sufficient to yield an ionization rate greater than about 10- 19 s -1 near the centre of the minihalo. The presence of CRs with energies ≤10 7 eV would indirectly enhance the molecular cooling in these regions, and we estimate that the resulting lower temperatures in these minihaloes would yield a characteristic stellar mass as low as ∼10M⊙. CRs have a less-pronounced effect on the cooling and collapse of primordial gas clouds inside more massive dark matter haloes with virial masses (≥10 8 M ⊙ at the later stages of cosmological structure formation around z ∼ 10-15. In these clouds, even without CR flux the molecular abundance is already sufficient to allow cooling to the floor set by the temperature of the cosmic microwave background." @default.
- W2993508563 created "2019-12-13" @default.
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- W2993508563 date "2007-12-01" @default.
- W2993508563 modified "2023-09-24" @default.
- W2993508563 title "Impact of Cosmic Rays on Population III Star Formation" @default.
- W2993508563 hasPublicationYear "2007" @default.
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