Self-consistent Semi-analytic Modeling of Feedback During Primordial Star Formation and Reionization

Abstract

We present a new semi-analytic model of the formation of the first stars. Our method takes dark matter halo merger trees (including 3-dimensional spatial information) from cosmological N-body simulations as input and applies analytic prescriptions to compute both the Population III (Pop III) and metal-enriched star formation histories. We have developed a novel method to accurately compute the major feedback processes affecting Pop III star formation: H${}_2$ photodissociation from Lyman-Werner (LW) radiation, suppression of star formation due to inhomogeneous reionization, and metal enrichment via supernovae winds. Our method utilizes a grid-based approach relying on fast Fourier transforms (FFTs) to rapidly track the LW intensity, ionization fraction, and metallicity in 3-dimensions throughout the simulation box. We present simulations for a wide range of astrophysical model parameters from $z\approx 30-6$. Initially long-range LW feedback and local metal enrichment and reionization feedback dominate. However, for $z\lesssim 15$ we find that the star formation rate density (SFRD) of Pop III stars is impacted by the combination of external metal enrichment (metals from one halo polluting other pristine halos) and inhomogeneous reionization. We find that the interplay of these processes is particularly important for the Pop III SFRD at $z\lesssim 10$. Reionization feedback delays star formation long enough for metal bubbles to reach halos that would otherwise form Pop III stars. Including these effects can lead to more than an order of magnitude decrease in the Pop III SFRD at $z=6$ compared to LW feedback alone.

18 pages, 8 figures, replaced with version accepted by ApJ

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• Cosmic Reionization May Still Have Started Early and Ended Late: Confronting Early Onset with CMB Anisotropy and 21 cm Global Signals
• Gravitational waves from the remnants of the first stars in nuclear star clusters
• Exploiting synergies between JWST and cosmic 21-cm observations to uncover star formation in the early Universe
• EDGE: The emergence of dwarf galaxy scaling relations from cosmological radiation-hydrodynamics simulations
• A-SLOTH reveals the nature of the first stars
• First Structure Formation under the Influence of Gas-Dark Matter Streaming Velocity and Density: Impact of the Baryons-trace-dark matter Approximation
• Tracing stars in Milky Way satellites with A-SLOTH
• Gravitational waves from mergers of Population III binary black holes: roles played by two evolution channels
• Modelling Population III stars for semi-numerical simulations
• A Model-Insensitive Baryon Acoustic Oscillation Feature in the 21 cm Signal from Reionization
• A hide-and-seek game: Looking for Population III stars during the Epoch of Reionization through the HeII$\lambda$1640 line
• Can Population III stars be major origins of both merging binary black holes and extremely metal poor stars?
• A Metal-Free Galaxy at $z=3.19$? Evidence of Late Population III Star Formation at Cosmic Noon
• Thermal and Reionisation History within a Large-Volume Semi-Analytic Galaxy Formation Simulation
• Astrophysical information from the Rayleigh-Jeans Tail of the CMB
• A Global Semi-Analytic Model of the First Stars and Galaxies Including Dark Matter Halo Merger Histories
• Aeos: Transport of Metals from Minihalos following Population III Stellar Feedback
• Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
• Gravitational wave backgrounds from coalescing black hole binaries at cosmic dawn: an upper bound
• Fisher matrix forecasts on the astrophysics of galaxies during the epoch of reionisation from the 21-cm power spectra
• Radiation magnetohydrodynamics simulations of Population III star formation during the Epoch of Reionization
• Type Ia Supernovae from First-generation Stars
• The Baryon Budget of Galaxies across the First Billion Years
• From Dark Matter Minihalos to Large-Scale Radiative Feedback: A Self-Consistent 3D Simulation of the First Stars and Galaxies using Neural Networks
• Effect of the cosmological transition to metal-enriched star-formation on the hydrogen 21-cm signal
• Radiative feedback on supermassive star formation: the massive end of the Population III initial mass function