Article Dans Une Revue Mon.Not.Roy.Astron.Soc. Année : 2021

Constraints on warm dark matter from UV luminosity functions of high-z galaxies with Bayesian model comparison

Anton Rudakovskyi
  • Fonction : Auteur
Andrei Mesinger
Denys Savchenko
  • Fonction : Auteur
Nicolas Gillet

Résumé

The number density of small dark matter (DM) haloes hosting faint high-redshift galaxies is sensitive to the DM free-streaming properties. However, constraining these DM properties is complicated by degeneracies with the uncertain baryonic physics governing star formation. In this work, we use a flexible astrophysical model and a Bayesian inference framework to analyse ultraviolet (UV) luminosity functions (LFs) at z = 6–8. We vary the complexity of the astrophysical galaxy model (single versus double power law for the stellar – halo mass relation) as well as the matter power spectrum [cold DM versus thermal relic warm DM (WDM)], comparing their Bayesian evidences. Adopting a conservatively wide prior range for the WDM particle mass, we show that the UV LFs at z = 6–8 only weakly favour cold DM over WDM. We find that particle masses of ≲ 2 keV are rejected at a 95 per cent credible level in all models that have a WDM-like power spectrum cutoff. This bound should increase to ∼2.5 keV with the James Webb Space Telescope (JWST).
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Dates et versions

hal-03210353 , version 1 (04-05-2023)

Identifiants

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Anton Rudakovskyi, Andrei Mesinger, Denys Savchenko, Nicolas Gillet. Constraints on warm dark matter from UV luminosity functions of high-z galaxies with Bayesian model comparison. Mon.Not.Roy.Astron.Soc., 2021, 507 (2), pp.3046-3056. ⟨10.1093/mnras/stab2333⟩. ⟨hal-03210353⟩
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