The impact of Lyα emission line heating and cooling on the cosmic dawn 21-cm signal

Avery Meiksin, Piero Madau

Research output: Contribution to journalArticlepeer-review

Abstract

Allowing for enhanced Lyα photon line emission from Population III dominated stellar systems in the first forming galaxies, we show the 21-cm cosmic dawn signal at 10 <z < 30 may substantially differ from standard scenarios. Energy transfer by Lyα photons emerging from galaxies may heat intergalactic gas if H II regions within galaxies are recombination bound, or cool the gas faster than by adiabatic expansion if reddened by winds internal to the haloes. In some extreme cases, differential 21-cm antenna temperatures near -500 mK may be achieved at 15 < z < 25, similar to the signature detected by the EDGES 21-cm cosmic dawn experiment.
Original languageEnglish
Pages (from-to)1920-1932
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume501
Issue number2
Early online date22 Dec 2020
DOIs
Publication statusPublished - 1 Feb 2021

Keywords

  • astro-ph.CO
  • astro-ph.GA

Fingerprint

Dive into the research topics of 'The impact of Lyα emission line heating and cooling on the cosmic dawn 21-cm signal'. Together they form a unique fingerprint.

Cite this