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Enhanced global signal of neutral hydrogen due to excess radiation at cosmic dawn (1802.07432v1)
Published 21 Feb 2018 in astro-ph.CO
Abstract: We revisit the global 21cm signal calculation incorporating a possible radio background at early times, and find that the global 21cm signal shows a much stronger absorption feature, which could enhance detection prospects for future 21 cm experiments. In light of recent reports of a possible low-frequency excess radio background, we propose that detailed 21 cm calculations should include a possible early radio background.
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