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- W2048533381 abstract "We use three-dimensional smoothed particle hydrodynamics simulations together with a dynamical ray-tracing scheme to investigate the build-up of the first H ii regions around massive Population III stars in minihaloes. We trace the highly anisotropic breakout of the ionising radiation into the intergalactic medium, allowing us to predict the resulting recombination radiation with greatly increased realism. Our simulations, together with Press-Schechter type arguments, allow us to predict the Population III contribution to the radio background at 100 MHz via bremsstrahlung and 21 cm emission. We find a global bremsstrahlung signal of around 1 mK, and a combined 21 cm signature which is an order of magnitude larger. Both might be within reach of the planned Square Kilometer Array experiment, although detection of the free-free emission is only marginal. The imprint of the first stars on the cosmic radio background might provide us with one of the few diagnostics to test the otherwise elusive minihalo star formation site." @default.
- W2048533381 created "2016-06-24" @default.
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- W2048533381 date "2009-10-21" @default.
- W2048533381 modified "2023-10-15" @default.
- W2048533381 title "The observational signature of the first H ii regions" @default.
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- W2048533381 doi "https://doi.org/10.1111/j.1365-2966.2009.15336.x" @default.
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