Revisiting The First Galaxies: The epoch of Population III stars

Abstract

We investigate the transition from primordial Population III (Pop III) star formation to normal Pop II star formation in the first galaxies using new cosmological hydrodynamic simulations. We find that while the first stars seed their host galaxies with metals, they cannot sustain significant outflows to enrich the intergalactic medium, even assuming a top-heavy initial mass function. This means that Pop III star formation could potentially continue until z~6 in different unenriched regions of the universe, before being ultimately shut off by cosmic reionization. Within an individual galaxy, the metal production and stellar feedback from Pop II stars overtake Pop III stars in 20-200 Myr, depending on galaxy mass.

9 pages, 7 figures, published in ApJ

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• Cosmic Reionization On Computers I. Design and Calibration of Simulations
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• Radiative Feedback from high mass X-ray binaries on the formation of the first galaxies and early reionization
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• The oldest and most metal poor stars in the APOSTLE Local Group simulations
• Legacy of star formation in the pre-reionization universe
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• The Lyman-alpha signature of the first galaxies
• The brief era of direct collapse black hole formation
• The First Stars: A Low-Mass Formation Mode
• Metal Transport and Chemical Heterogeneity in Early Star Forming Systems
• Spatially adaptive radiation-hydrodynamical simulations of galaxy formation during cosmological reionization
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• Heating the IGM by X-rays from Population III Binaries in High Redshift Galaxies
• Finding the First Cosmic Explosions. III. Pulsational Pair-Instability Supernovae
• The first galaxies: simulating their feedback-regulated assembly
• Probing the stellar initial mass function with high-$z$ supernovae
• Galactic angular momentum in cosmological zoom-in simulations. I. Disk and bulge components and the galaxy--halo connection
• Characterization of Population III Stars with Stellar Atmosphere and Evolutionary Modeling and Predictions of their Observability with the James Webb Space Telescope
• Origin of Cosmic Chemical Abundances
• Pair-Instability Supernovae in the Local Universe
• Star formation in the first galaxies - III. Formation, evolution, and characteristics of the first stellar cluster
• Boosting Lya and HeII 1640A Line Fluxes from Pop III Galaxies: Stochastic IMF Sampling and Departures from Case-B
• Detecting Pair-Instability Supernovae at z<5 with the James Webb Space Telescope
• Radiative feedback and cosmic molecular gas: the role of different radiative sources
• Ultrafaint Dwarfs - Star Formation and Chemical Evolution in the Smallest Galaxies
• Detecting strongly lensed supernovae at z ~ 5-7 with LSST
• The Dark Ages of the Universe and Hydrogen Reionization
• Gravitational waves from mergers of Population III binary black holes: roles played by two evolution channels
• Constraining Very High Mass Population III Stars through He II Emission in Galaxy BDF-521 at z = 7.01
• The high-redshift tail of stellar reionization in LCDM is beyond the reach of the low-$\ell$ CMB
• Dating N loud AGNs at high redshift: GS3073 as a snapshot of wCen like evolution of a nuclear star cluster
• Growth and Feedback from the First Black Holes
• Radiation magnetohydrodynamics simulations of Population III star formation during the Epoch of Reionization
• When did the initial mass function become bottom-heavy?