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

Abstract

The number density of small dark matter (DM) halos 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 ultra-violet (UV) luminosity functions (LFs) at z=6-8. We vary the complexity of the galaxy model (single vs double power law for the stellar -- halo mass relation) as well as the matter power spectrum (cold DM vs thermal relic warm DM), 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 CDM over WDM. We find that particle masses of $\lesssim$2 keV are rejected at a 95% 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).

prepared for submission to MNRAS

References in corpus (22)

• UV Luminosity Functions at redshifts z~4 to z~10: 10000 Galaxies from HST Legacy Fields
• Massloss of galaxies due to a UV-background
• New Determinations of the UV Luminosity Functions from z~9 to z~2 show a remarkable consistency with halo growth and a constant star formation efficiency
• Constraints on the Dark Matter Particle Mass from the Number of Milky Way Satellites
• New Constraints on the Faint-end of the UV Luminosity Function at z~7-8 using the Gravitational Lensing of the Hubble Frontier Fields Cluster A2744
• Essential physics of early galaxy formation
• Constraints from Ly-$\alpha$ forests on non-thermal dark matter including resonantly-produced sterile neutrinos
• The Global 21-cm Signal in the Context of the High-z Galaxy Luminosity Function
• Dust attenuation, dust emission, and dust temperature in galaxies at z>=5: a view from the FIRE-2 simulations
• Joint constraints on thermal relic dark matter from strong gravitational lensing, the Lyman-$\alpha$ forest, and Milky Way satellites
• Dark Matter Constraints from a Unified Analysis of Strong Gravitational Lenses and Milky Way Satellite Galaxies
• Constraints on the properties of warm dark matter using the satellite galaxies of the Milky Way
• Early galaxy formation in warm dark matter cosmologies
• Fundamental physics with the Hubble Frontier Fields: constraining Dark Matter models with the abundance of extremely faint and distant galaxies
• Fuzzy Dark Matter and the 21cm Power Spectrum
• Bayesian Methods in Cosmology
• Warm Dark Matter and Cosmic Reionization
• ETHOS -- An Effective Theory of Structure Formation: Impact of Dark Acoustic Oscillations on Cosmic Dawn
• Dark acoustic oscillations: Imprints on the matter power spectrum and the halo mass function
• Bayesian Model Selection with Future 21cm Observations of The Epoch of Reionisation
• Circularly polarized states and propagating bound states in the continuum in a periodic array of cylinders
• Degeneracies between baryons and dark matter: the challenge of constraining the nature of dark matter with JWST

Cited by in corpus (18)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• The Present and Future Status of Heavy Neutral Leptons
• The Impact of the First Galaxies on Cosmic Dawn and Reionization
• Breaking degeneracies in the first galaxies with clustering
• New Roads to the Small-Scale Universe: Measurements of the Clustering of Matter with the High-Redshift UV Galaxy Luminosity Function
• Alleviating the need for exponential evolution of JWST galaxies in 10${}^{10}{M}_{\odot }$ haloes at $z>10$ by a modified $\Lambda$CDM power spectrum
• GALLUMI: A Galaxy Luminosity Function Pipeline for Cosmology and Astrophysics
• From Images to Dark Matter: End-To-End Inference of Substructure From Hundreds of Strong Gravitational Lenses
• JWST high-z galaxy constraints on warm and cold dark matter models
• BEoRN: A fast and flexible framework to simulate the epoch of reionisation and cosmic dawn
• LIMFAST. I. A Semi-Numerical Tool for Line Intensity Mapping
• Starlight from JWST: Implications for star formation and dark matter models
• Anticipating the XRISM search for the decay of resonantly produced sterile neutrino dark matter
• Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Structure at Small Scales
• The 21-cm signal from the Cosmic Dawn: metallicity dependence of high mass X-ray binaries
• Milky Way Satellite Census. IV. Constraints on Decaying Dark Matter from Observations of Milky Way Satellite Galaxies
• Probing the warm dark matter mass with [C II] intensity mapping
• Probing power spectrum enhancement at small scales with the SKA