تقرير
Constraints on warm dark matter from UV luminosity functions of high-z galaxies with Bayesian model comparison
| العنوان: | Constraints on warm dark matter from UV luminosity functions of high-z galaxies with Bayesian model comparison |
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| المؤلفون: | Rudakovskyi, Anton, Mesinger, Andrei, Savchenko, Denys, Gillet, Nicolas |
| سنة النشر: | 2021 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | 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). Comment: prepared for submission to MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stab2333 |
| URL الوصول: | http://arxiv.org/abs/2104.04481 |
| رقم الأكسشن: | edsarx.2104.04481 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stab2333 |
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