The formation of the first galaxies and the transition to low-mass star formation

Abstract

The formation of the first galaxies at redshifts z ~ 10-15 signaled the transition from the simple initial state of the universe to one of ever increasing complexity. We here review recent progress in understanding their assembly process with numerical simulations, starting with cosmological initial conditions and modelling the detailed physics of star formation. In this context we emphasize the importance and influence of selecting appropriate initial conditions for the star formation process. We revisit the notion of a critical metallicity resulting in the transition from primordial to present-day initial mass functions and highlight its dependence on additional cooling mechanisms and the exact initial conditions. We also review recent work on the ability of dust cooling to provide the transition to present-day low-mass star formation. In particular, we highlight the extreme conditions under which this transition mechanism occurs, with violent fragmentation in dense gas resulting in tightly packed clusters.

arXiv comment16 pages, 7 figures, appeared in the conference proceedings for IAU Symposium 255: Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies, a high resolution version (highly recommended) can be found at http://www.ita.uni-heidelberg.de/~tgreif/files/greif08.pdf

References in corpus (79)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Embedded Clusters in Molecular Clouds
• How Massive Single Stars End their Life
• The Nucleosynthetic Signature of Population III
• In the Beginning: The First Sources of Light and the Reionization of the Universe
• The First Stars
• Origin of Galactic and Extragalactic Magnetic Fields
• On the properties of massive Population III stars and metal-free stellar populations
• Nucleosynthetic signatures of the first stars
• Nucleosynthesis of Zinc and Iron-Peak Elements in Pop III Type II Supernovae : Comparison with abundances of Very Metal-Poor Halo Stars
• A stellar relic from the early Milky Way
• Thermal and Fragmentation Properties of Star-forming Clouds in Low-metallicity Environments
• First stars, very massive black holes and metals
• Formation of Primordial Stars in a LCDM Universe
• The Formation of the First Low-Mass Stars From Gas With Low Carbon and Oxygen Abundances
• Generic Spectrum and Ionization Efficiency of a Heavy Initial Mass Function for the First Stars
• Massive star formation: Nurture, not nature
• Star formation through gravitational collapse and competitive accretion
• Second-Generation Objects in the Universe: Radiative Cooling and Collapse of Halos with Virial Temperatures Above 10^4 Kelvin
• The Radiative Feedback of the First Cosmological Objects
• Formation of the First Stars by Accretion
• The First Cosmic Structures and their Effects
• Early Metal Enrichment of the Intergalactic Medium by Pregalactic Outflows
• The Binary Frequency Among Carbon-Enhanced, s-Process Rich, Metal-Poor Stars
• Supernova Nucleosynthesis in Population III 13 -- 50 $M_{\odot }$ Stars and Abundance Patterns of Extremely Metal-Poor Stars
• Photoevaporation of Cosmological Minihalos during Reionization
• Radiation Hydrodynamical Evolution of Primordial H II Regions
• Fragmentation of star-forming clouds enriched with the first dust
• Resolving the Formation of Protogalaxies. III. Feedback from the First Stars
• The Structure and Evolution of Early Cosmological HII Regions
• Photoionization Feedback in Low--Mass Galaxies at High Redshift
• Accretion in stellar clusters and the IMF
• The First Galaxies: Assembly, Cooling and the Onset of Turbulence
• Population III star formation in a Lambda CDM universe, I: The effect of formation redshift and environment on protostellar accretion rate
• The H II Region of the First Star
• Early Metal Enrichment by Pregalactic Outflows: II. Simulations of Blow-away
• Probing the Formation of the First Low-Mass Stars with Stellar Archaeology
• Three Epochs of Star Formation in the High Redshift Universe
• Early Cosmological HII/HeIII Regions and Their Impact on Second-Generation Star Formation
• The Destruction of Cosmological Minihalos by Primordial Supernovae
• The First Supernova Explosions in the Universe
• Star formation at very low metallicity. I: Chemistry and cooling at low densities
• The aftermath of the first stars: massive black holes
• Feedback from Galaxy Formation: Production and Photodissociation of Primordial Molecular Hydrogen
• Two populations of metal-free stars in the early Universe
• The HII Region of a Primordial Star
• Was the Universe Reionized by Massive Population-III Stars?
• Resolving the Formation of Protogalaxies. I. Virialization
• The First Supernova Explosions: Energetics, Feedback, and Chemical Enrichment
• The Era of Massive Population III Stars: Cosmological Implications and Self-Termination
• Supernova Explosions in the Early Universe: Evolution of Radiative Remnants and the Halo Destruction Efficiency
• Critical Metallicity and Fine-Structure Emission of Primordial Gas Enriched by the First Stars
• Local radiative feedback in the formation of the first protogalaxies
• The Origin of Carbon-Enhancement and Initial Mass Function of Extremely Metal-Poor Stars in the Galactic Halo
• The Formation of the First Globular Clusters in Dwarf Galaxies Before the Epoch of Reionization
• Radiation Feedback and Fragmentation in Massive Protostellar Cores
• Accretion onto a Primordial Protostar
• The Formation of the First Stars in the Universe
• The Biermann Battery in Cosmological MHD Simulations of Population III Star Formation
• The Dark Age of the Universe
• Occurrence of Metal-free Galaxies in the Early Universe
• Reionisation, chemical enrichment and seed black holes from the first stars: is Population III important?
• Does Radiative Feedback by the First Stars Promote or Prevent Second Generation Star Formation?
• How the First Stars Regulated Local Star Formation I: Radiative Feedback
• The Positive Feedback of Pop III Objects on Galaxy Formation
• Formation of Population III Stars in Fossil HII Regions: Significance of HD
• Chemical mixing in smoothed particle hydrodynamics simulations
• The Origins of Two Classes of Carbon-Enhanced, Metal-Poor Stars
• Reionization - A probe for the stellar population and the physics of the early universe
• Secondary Star Formation in a Population III Object
• Protostellar Disk Dynamos and Hydromagnetic Outflows in Primordial Star Formation
• Dust-cooling--induced Fragmentation of Low-metallicity Clouds
• The First Jet in the Universe: Protostellar Jets from the First Stars
• Low-Mass Star Formation, Triggered by Supernova in Primordial Clouds
• Star formation at very low metallicity. II: On the insignificance of metal-line cooling during the early stages of gravitational collapse
• On the First Generation of Stars
• Stellar Mass Spectra from Non-Isothermal Gravoturbulent Fragmentation
• Induced Formation of Primordial Low-Mass Stars
• Did Massive Primordial Stars Preenrich the Lyman Alpha Forest?

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