A Limit on the Warm Dark Matter Particle Mass from the Redshifted 21 cm Absorption Line

Mohammadtaher Safarzadeh, Evan Scannapieco, Arif Babul

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The recent Experiment to Detect the Global Epoch of Reionization Signature (EDGES) collaboration detection of an absorption signal at a central frequency of ν = 78 ± 1 MHz points to the presence of a significant Lyα background by a redshift of z = 18. The timing of this signal constrains the dark matter particle mass (m χ) in the warm dark matter (WDM) cosmological model. WDM delays the formation of small-scale structures, and therefore a stringent lower limit can be placed on m χ based on the presence of a sufficiently strong Lyα background due to star formation at z = 18. Our results show that coupling the spin temperature to the gas through Lyα pumping requires a minimum mass of m χ > 3 keV if atomic cooling halos dominate the star formation rate at z = 18, and m χ > 2 keV if cooling halos also form stars efficiently at this redshift. These limits match or exceed the most stringent limits cited to date in the literature, even in the face of the many uncertainties regarding star formation at high redshift.

Original languageEnglish (US)
Article numberL18
JournalAstrophysical Journal Letters
Volume859
Issue number2
DOIs
StatePublished - Jun 1 2018

Fingerprint

particle mass
dark matter
star formation
halos
time measurement
cooling
spin temperature
star formation rate
pumping
signatures
stars
gases
gas
particle
experiment
temperature

Keywords

  • dark ages
  • first stars - dark matter - diffuse radiation
  • reionization

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

A Limit on the Warm Dark Matter Particle Mass from the Redshifted 21 cm Absorption Line. / Safarzadeh, Mohammadtaher; Scannapieco, Evan; Babul, Arif.

In: Astrophysical Journal Letters, Vol. 859, No. 2, L18, 01.06.2018.

Research output: Contribution to journalArticle

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