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• W2958315578 abstract "We use thirty-eight high-resolution simulations of galaxy formation between redshift 10 and 5 to study the impact of a 3 keV warm dark matter (WDM) candidate on the high-redshift Universe. We focus our attention on the stellar mass function and the global star formation rate and consider the consequences for reionization, namely the neutral hydrogen fraction evolution and the electron scattering optical depth. We find that three different effects contribute to differentiate warm and cold dark matter (CDM) predictions: WDM suppresses the number of haloes with mass less than few $10^9$ M$_{odot}$; at a fixed halo mass, WDM produces fewer stars than CDM; and finally at halo masses below $10^9$ M$_{odot}$, WDM has a larger fraction of dark haloes than CDM post-reionization. These three effects combine to produce a lower stellar mass function in WDM for galaxies with stellar masses at and below $sim 10^7$ M$_{odot}$. For $z > 7$, the global star formation density is lower by a factor of two in the WDM scenario, and for a fixed escape fraction, the fraction of neutral hydrogen is higher by 0.3 at $z sim 6$. This latter quantity can be partially reconciled with CDM and observations only by increasing the escape fraction from 23 per cent to 34 per cent. Overall, our study shows that galaxy formation simulations at high redshift are a key tool to differentiate between dark matter candidates given a model for baryonic physics." @default.
• W2958315578 created "2019-07-23" @default.
• W2958315578 creator A5006999794 @default.
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• W2958315578 date "2019-07-12" @default.
• W2958315578 modified "2023-10-16" @default.
• W2958315578 title "Clues to the nature of dark matter from first galaxies" @default.
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• W2958315578 doi "https://doi.org/10.1093/mnras/stz1924" @default.
• W2958315578 hasPublicationYear "2019" @default.
• W2958315578 type Work @default.
• W2958315578 sameAs 2958315578 @default.

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