Triggered Population III star formation: the effect of H${}_2$ self-shielding

Abstract

The multiplicity of metal-free (Population III) stars may influence their feedback efficiency within their host dark matter halos, affecting subsequent metal enrichment and the transition to galaxy formation. Radiative feedback from massive stars can trigger nearby star formation in dense self-shielded clouds. In model radiation self-shielding, the H${}_2$ column density must be accurately computed. In this study, we compare two local approximations based on the density gradient and Jeans length with a direct integration of column density along rays. After the primary massive star forms, we find that no secondary stars form for both the direct integration and density gradient approaches. The approximate method reduces the computation time by a factor of 2. The Jeans length approximation overestimates the H${}_2$ column density by a factor of 10, leading to five numerically enhanced self-shielded, star-forming clumps. We conclude that the density gradient approximation is sufficiently accurate for larger volume galaxy simulations, although one must still caution that the approximation cannot fully reproduce the result of direct integration.

arXiv comment14 pages, 7 figures, 3 tables, accepted to MNRAS

References in corpus (64)

• Planck 2015 results. XIII. Cosmological parameters
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• A Multi-Code Analysis Toolkit for Astrophysical Simulation Data
• On the properties of massive Population III stars and metal-free stellar populations
• Enzo: An Adaptive Mesh Refinement Code for Astrophysics
• Multi-scale initial conditions for cosmological simulations
• Structure of Stationary Photodissociation Fronts
• The Assembly of the First Massive Black Holes
• Extreme Water Loss and Abiotic O${}_2$ Buildup On Planets Throughout the Habitable Zones of M Dwarfs
• Forming the First Stars in the Universe: The Fragmentation of Primordial Gas
• Simulations of Early Structure Formation: Primordial Gas Clouds
• One Hundred First Stars : Protostellar Evolution and the Final Masses
• Modelling Primordial Gas in Numerical Cosmology
• Photodissociation and photoionisation of atoms and molecules of astrophysical interest
• The Birth of a Galaxy: Primordial Metal Enrichment and Stellar Populations
• Protostellar Feedback Halts the Growth of the First Stars in the Universe
• The Formation of Population III Binaries from Cosmological Initial Conditions
• Grackle: a Chemistry and Cooling Library for Astrophysics
• Primordial Star Formation under the Influence of Far Ultraviolet Radiation: 1540 Cosmological Halos and the Stellar Mass Distribution
• Protostellar Collapse with Various Metallicities
• The Mass Spectrum of the First Stars
• Primordial Star Formation under Far-ultraviolet radiation
• The Structure and Evolution of Early Cosmological HII Regions
• Low-Mass Relics of Early Star Formation
• The First Stars: Mass Growth Under Protostellar Feedback
• Population III star formation in a Lambda CDM universe, II: Effects of a photodissociating background
• Photodissociation of H2 in Protogalaxies: Modeling Self-Shielding in 3D Simulations
• Formation of massive black holes in rapidly growing pre-galactic gas clouds
• Galaxy Properties and UV Escape Fractions During Epoch of Reionization: Results from the Renaissance Simulations
• Early Cosmological HII/HeIII Regions and Their Impact on Second-Generation Star Formation
• The Destruction of Cosmological Minihalos by Primordial Supernovae
• Enzo+Moray: Radiation Hydrodynamics Adaptive Mesh Refinement Simulations with Adaptive Ray Tracing
• Feedback from Galaxy Formation: Production and Photodissociation of Primordial Molecular Hydrogen
• The cooling of shock-compressed primordial gas
• Dynamical Expansion of Ionization and Dissociation Front around a Massive Star. II. On the Generality of Triggered Star Formation
• TreeCol: a novel approach to estimating column densities in astrophysical simulations
• Magnetic Fields in Population III Star Formation
• The First Population II Stars Formed in Externally Enriched Mini-halos
• On the Hydrodynamic Interaction of Shock Waves with Interstellar Clouds. II. The Effect of Smooth Cloud Boundaries on Cloud Destruction and Cloud Turbulence
• The Birth of a Massive First-Star Binary
• Confined Population III Enrichment and the Prospects for Prompt Second-Generation Star Formation
• The influence of streaming velocities and Lyman-Werner radiation on the formation of the first stars
• Cradles of the first stars: self-shielding, halo masses, and multiplicity
• Formation sites of Population III star formation: The effects of different levels of rotation and turbulence on the fragmentation behavior of primordial gas
• Merge or survive: Number of Population III stars per minihalo
• Metal Transport and Chemical Heterogeneity in Early Star Forming Systems
• Metal-poor star formation triggered by the feedback effects from Pop III stars
• Dynamical Expansion of Ionization and Dissociation Front around a Massive Star. I. A Mode of Triggered Star Formation
• Seeding the Second Star: enrichment from population III, dust evolution, and cloud collapse
• Chemistry and radiative shielding in star forming galactic disks
• How an improved implementation of H2 self-shielding influences the formation of massive stars and black holes
• Low-mass star formation triggered by early supernova explosions
• The Emergence of the First Star-free Atomic Cooling Haloes in the Universe
• Abundance anomalies in metal-poor stars from Population III supernova ejecta hydrodynamics
• Radiative cooling implementations in simulations of primordial star formation
• H2 self-shielding with non-LTE rovibrational populations: implications for cooling in protogalaxies
• How the First Stars Regulated Star Formation. II. Enrichment by Nearby Supernovae
• Less effective hydrodynamic escape of H${}_2$-H${}_2$O atmospheres on terrestrial planets orbiting pre-main sequence M dwarfs
• Metal Mixing in Minihalos: The Descendants of Pair-Instability Supernovae
• Multifrequency radiation hydrodynamics simulations of H2 line emission in primordial, star-forming clouds
• Highly r-process enhanced stars in ultra-faint dwarf galaxies
• Do the environmental conditions affect the dust-induced fragmentation in low-metallicity clouds ?: Effect of pre-ionization and far-ultraviolet/cosmic-ray fields

Cited by in corpus (1)

• Population III star formation in an X-ray background: III. Periodic radiative feedback and luminosity induced by elliptical orbits