AstraeusIV : Quantifying the star formation histories of galaxies in the Epoch of Reionization

Abstract

We use the \textsc{astraeus} framework, that couples an N-body simulation with a semi-analytic model for galaxy formation and a semi-numerical model for reionization, to quantify the star formation histories (SFHs) of galaxies in the first billion years. Exploring four models of radiative feedback, we fit the SFH of each galaxy at $z>5$ as $\log (\mathrm{SFR}(z))=-\alpha (1+z)+\beta$; star formation is deemed stochastic if it deviates from this fit by more than ${\Delta }_{\mathrm{SFR}}=0.6$dex. Our key findings are: (i) The fraction of stellar mass formed and time spent in the stochastic phase decrease with increasing stellar mass and redshift $z$. While galaxies with stellar masses of $M_{\star }\sim 10^7{M}_{\odot }$ at $z\sim 5(10)$ form $\sim 70\%(20\%)$ of their stellar mass in the stochastic phase, this reduces to $<10\%$ at all redshifts for galaxies with $M_{\star }>10^{10}{M}_{\odot }$; (ii) the fractional mass assembled and lifetime spent in the stochastic phase do not significantly change with the radiative feedback model used; (iii) at all redshifts, $\alpha$ increases (decreases for the strongest radiative feedback model) with stellar mass for galaxies with $M_{\star }\lesssim 10^{8.5}{M}_{\odot }$ and converges to $\sim 0.18$ for more massive galaxies; $\beta$ always increases with stellar mass. Our proposed fits can reliably recover the stellar masses and mass-to-light ratios for galaxies with $M_{\star }\sim 10^{8-10.5}{M}_{\odot }$ and $M_{UV}\sim -17\mathrm{to}-23$ at $z\sim 5-9$. This physical model can therefore be used to derive the SFHs for galaxies observed by a number of forthcoming instruments.

arXiv comment19 pages, 14 figures, accepted for publication in MNRAS

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Cited by in corpus (10)

• The brightest galaxies at Cosmic Dawn
• Carbonaceous dust grains seen in the first billion years of cosmic time
• The ALMA REBELS Survey: Specific Star-Formation Rates in the Reionization Era
• Bursty star formation during the Cosmic Dawn driven by delayed stellar feedback
• Quantifying the Effects of Known Unknowns on Inferred High-redshift Galaxy Properties: Burstiness, the IMF, and Nebular Physics
• Identification of a transition from stochastic to secular star formation around $z=9$ with JWST
• The impact of an evolving stellar initial mass function on early galaxies and reionisation
• Astraeus VI: Hierarchical assembly of AGN and their large-scale effect during the Epoch of Reionization
• Astraeus VII: The environmental-dependent assembly of galaxies in the Epoch of Reionization
• POLAR-II: modeling star formation history of galaxies on the 21-cm signal from Epoch of Reionization