Enhanced Global Signal of Neutral Hydrogen Due to Excess Radiation at Cosmic Dawn
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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.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/dbfee0b3d17612033de4710d744dcc758c223a58
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In Astronomy and Astrophysics
In Nuclear and High Energy Physics
Citations in the corpus
- Modeling the Radio Background from the First Black Holes at Cosmic Dawn: Implications for the 21 cm Absorption Amplitude (2018, background): “During the completion of this manuscript, Feng & Holder (2018) investigated the potential for 21 cm experiments to constrain the existence of a so far unexplained excess in the radio background measured by the ARCADE-2 experiment (Fixsen et al. 2011).”