Enhanced Global Signal of Neutral Hydrogen Due to Excess Radiation at Cosmic Dawn

Chang Feng; Gilbert Holder

doi:10.3847/2041-8213/aac0fe

Enhanced Global Signal of Neutral Hydrogen Due to Excess Radiation at Cosmic Dawn

Research output: Contribution to journal › Article › peer-review

Abstract

We revisit the global 21 cm signal calculation incorporating a possible radio background at early times, and find that the global 21 cm 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.

Original language	English (US)
Article number	L17
Journal	Astrophysical Journal Letters
Volume	858
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/aac0fe
State	Published - May 10 2018

Keywords

cosmology: theory
dark ages, reionization, first stars
early universe
methods: analytical
radio continuum: general

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/2041-8213/aac0fe

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abstract = "We revisit the global 21 cm signal calculation incorporating a possible radio background at early times, and find that the global 21 cm 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.",

keywords = "cosmology: theory, dark ages, reionization, first stars, early universe, methods: analytical, radio continuum: general",

author = "Chang Feng and Gilbert Holder",

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N2 - We revisit the global 21 cm signal calculation incorporating a possible radio background at early times, and find that the global 21 cm 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.

AB - We revisit the global 21 cm signal calculation incorporating a possible radio background at early times, and find that the global 21 cm 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.

KW - cosmology: theory

KW - dark ages, reionization, first stars

KW - early universe

KW - methods: analytical

KW - radio continuum: general

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Enhanced Global Signal of Neutral Hydrogen Due to Excess Radiation at Cosmic Dawn

Abstract

Keywords

ASJC Scopus subject areas

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