Star formation in the first galaxies - III. Formation, evolution, and characteristics of the first stellar cluster

Abstract

We simulate the formation of a low metallicity (0.01 Zsun) stellar cluster in a dwarf galaxy at redshift z~14. Beginning with cosmological initial conditions, the simulation utilizes adaptive mesh refinement and sink particles to follow the collapse and evolution of gas past the opacity limit for fragmentation, thus resolving the formation of individual protostellar cores. A time- and location-dependent protostellar radiation field, which heats the gas by absorption on dust, is computed by integration of protostellar evolutionary tracks with the MESA code. The simulation also includes a robust non-equilibrium chemical network that self-consistently treats gas thermodynamics and dust-gas coupling. The system is evolved for 18 kyr after the first protostellar source has formed. In this time span, 30 sink particles representing protostellar cores form with a total mass of 81 Msun. Their masses range from ~0.1 Msun to 14.4 Msun with a median mass ~0.5-1 Msun. Massive protostars grow by competitive accretion while lower-mass protostars are stunted in growth by close encounters and many-body ejections. In the regime explored here, the characteristic mass scale is determined by the temperature floor set by the cosmic microwave background and by the onset of efficient dust-gas coupling. It seems unlikely that host galaxies of the first bursts of metal-enriched star formation will be detectable with the James Webb Space Telescope or other next-generation infrared observatories. Instead, the most promising access route to the dawn of cosmic star formation may lie in the scrutiny of metal-poor, ancient stellar populations in the Galactic neighborhood. The observable targets that correspond to the system simulated here are ultra-faint dwarf satellite galaxies such as Bootes II, Segue I and II, and Willman I.

15 pages, 7 figures. Submitted to MNRAS. Comments welcome

References in corpus (36)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Theory of Star Formation
• The James Webb Space Telescope
• Cold Dark Clouds: The Initial Conditions for Star Formation
• Analytical theory for the initial mass function: CO clumps and prestellar cores
• Modeling Collapse and Accretion in Turbulent Gas Clouds: Implementation and Comparison of Sink Particles in AMR and SPH
• Radiation-Hydrodynamic Simulations of Collapse and Fragmentation in Massive Protostellar Cores
• Star formation through gravitational collapse and competitive accretion
• The Quenching of the Ultra-Faint Dwarf Galaxies in the Reionization Era
• The Mass Distribution and Lifetime of Prestellar Cores in Perseus, Serpens, and Ophiuchus
• The Effects of Radiative Transfer on Low-Mass Star Formation
• Fragmentation of star-forming clouds enriched with the first dust
• A new Jeans resolution criterion for (M)HD simulations of self-gravitating gas: Application to magnetic field amplification by gravity-driven turbulence
• The Importance of Radiative Feedback for the Stellar Initial Mass Function
• Resolving the Formation of Protogalaxies. III. Feedback from the First Stars
• Population III stars: hidden or disappeared ?
• The First Galaxies: Assembly, Cooling and the Onset of Turbulence
• Resolving the Formation of Protogalaxies. II. Central Gravitational Collapse
• The Global Evolution of Giant Molecular Clouds. I: Model Formulation and Quasi-Equilibrium Behavior
• Modeling jet and outflow feedback during star cluster formation
• Resolving the Formation of Protogalaxies. I. Virialization
• The Jeans mass and the origin of the knee in the IMF
• The statistical properties of stars and their dependence on metallicity: the effects of opacity
• Supersonic turbulence, filamentary accretion,and the rapid assembly of massive stars and disks
• Star Formation in the First Galaxies I: Collapse Delayed by Lyman-Werner Radiation
• The First Galaxies: Assembly of Disks and Prospects for Direct Detection
• Recovery from population III supernova explosions and the onset of second generation star formation
• Early turbulent mixing as the origin of chemical homogeneity in open star clusters
• The Transition from the First Stars to the Second Stars in the Early Universe
• The Lyman-alpha signature of the first galaxies
• The Fate of the First Galaxies. III. Properties of Primordial Dwarf Galaxies and their Impact on the Intergalactic Medium
• The first galaxies: simulating their feedback-regulated assembly
• Metallicity and the Universality of the IMF
• Primordial star clusters at extreme magnification
• Multifrequency radiation hydrodynamics simulations of H2 line emission in primordial, star-forming clouds
• Formation of carbon-enhanced metal-poor stars in the presence of far ultraviolet radiation

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• Connecting the first galaxies with ultra faint dwarfs in the Local Group: chemical signatures of Population~III stars
• Transition of the initial mass function in the metal-poor environments
• Preserving chemical signatures of primordial star formation in the first low-mass stars
• Impact of the cosmic background radiation on the initial mass function of metal-poor stars
• Seeding the Second Star: enrichment from population III, dust evolution, and cloud collapse
• Chemistry and radiative shielding in star forming galactic disks
• Gravitational collapse and the thermal evolution of low-metallicity gas clouds in the early Universe
• The role of faint population III supernovae in forming CEMP stars in ultra-faint dwarf galaxies
• A needle in a haystack? Catching Pop III stars in the Epoch of Reionization: I. Pop III star forming environments
• Radiation pressure in super star cluster formation
• Abundance anomalies in metal-poor stars from Population III supernova ejecta hydrodynamics
• Fragmentation inside atomic cooling haloes exposed to Lyman-Werner radiation
• Signature of the first galaxies in JWST deep field observations
• Seeding the second star -- II. CEMP star formation enriched from faint supernovae
• Gravitational waves from the remnants of the first stars in nuclear star clusters
• Impact of magnetic fields on Population III star formation
• Positive or Negative? The Impact of X-ray Feedback on the Formation of Direct Collapse Black Hole Seeds
• Gravitational waves from mergers of Population III binary black holes: roles played by two evolution channels
• Protostellar-disc fragmentation across all metallicities
• The chemical evolution of self-gravitating primordial disks
• Exploring effects of IMF sampling and SN feedback injection on star formation and metallicity in ultra-faint dwarf galaxies
• Understanding Stellar Mass-Metallicity and Size Relations in Simulated Ultra-Faint Dwarf Galaxies
• Condition for low-mass star formation in shock-compressed metal-poor clouds
• Star Formation for Predictive Primordial Galaxy Formation
• Star Formation Beyond the Optical Disk : The Low-Density Outskirts of NGC2090