Slow Cooling in Low Metallicity Clouds: An Origin of Globular Cluster Bimodality?
arXiv:1806.11163 · doi:10.1093/mnras/sty1361
Abstract
We explore the relative role of small-scale fragmentation and global collapse in low-metallicity clouds, pointing out that in such clouds the cooling time may be longer than the dynamical time, allowing the cloud to collapse globally before it can fragment. This, we suggest, may help to explain the formation of the low-metallicity globular cluster population, since such dense stellar systems need a large amount of gas to be collected in a small region (without significant feedback during the collapse). To explore this further, we carry out numerical simulations of low-metallicity Bonner-Ebert stable gas clouds, demonstrating that there exists a critical metallicity (between 0.001 and 0.01 ) below which the cloud collapses globally without fragmentation. We also run simulations including a background radiative heating source, showing that this can also produce clouds that do not fragment, and that the critical metallicity -- which can exceed the no-radiation case -- increases with the heating rate.
arXiv comment12 pages, 9 figures, MNRAS in press
References in corpus (53)
- The Formation of the First Star in the Universe
- A Multi-Code Analysis Toolkit for Astrophysical Simulation Data
- Radiative transfer in a clumpy universe: IV. New synthesis models of the cosmic UV/X-ray background
- Young massive star clusters
- Enzo: An Adaptive Mesh Refinement Code for Astrophysics
- Extragalactic Globular Clusters and Galaxy Formation
- Intrinsic iron spread and a new metallicity scale for Globular Clusters
- The O-Na and Mg-Al Anticorrelations in Turn-Off and early Subgiants in Globular Clusters
- The First Galaxies
- Thermal and Fragmentation Properties of Star-forming Clouds in Low-metallicity Environments
- The Formation of the First Low-Mass Stars From Gas With Low Carbon and Oxygen Abundances
- The ACS Virgo Cluster Survey IX: The Color Distributions of Globular Cluster Systems in Early-Type Galaxies
- Massive binaries as the source of abundance anomalies in globular clusters
- On the Origin of Globular Cluster Systems in Elliptical and cD Galaxies
- Grackle: a Chemistry and Cooling Library for Astrophysics
- Modeling the Metallicity Distribution of Globular Clusters
- Globular clusters as the relics of regular star formation in 'normal' high-redshift galaxies
- Protostellar Collapse with Various Metallicities
- Super-Massive Stars as a Source of Abundance Anomalies of Proton-Capture Elements in Globular Clusters
- Yields of AGB and SAGB models with chemistry of low- and high-metallicity Globular Clusters
- Evidence for the Strong Effect of Gas Removal on the Internal Dynamics of Young Stellar Clusters
- On the Formation of Globular Cluster Systems in a Hierarchical Universe
- Abundance patterns of multiple populations in Globular Clusters: a chemical evolution model based on yields from AGB ejecta
- Globular Cluster Systems I: V-I Color Distributions
- Origin of multiple stellar populations in globular clusters and their helium enrichment
- Globular cluster formation in the context of galaxy formation and evolution
- Critical Metallicity and Fine-Structure Emission of Primordial Gas Enriched by the First Stars
- Star cluster formation in cosmological simulations. I. Properties of young clusters
- Superbubble dynamics in globular cluster infancy II. Consequences for secondary star formation in the context of self-enrichment via fast rotating massive stars
- BRIDGE: A Direct-tree Hybrid N-body Algorithm for Fully Self-consistent Simulations of Star Clusters and their Parent Galaxies
- A General Abundance Problem for All Self-Enrichment Scenarios for the Origin of Multiple Populations in Globular Clusters
- Mixed Populations in Globular Clusters: Et Tu, 47 Tuc?
- An Age Difference of 2 Gyr between a Metal-Rich and a Metal-Poor Globular Cluster
- The metallicity bimodality of globular cluster systems: a test of galaxy assembly and of the evolution of the galaxy mass-metallicity relation
- The origin of the Milky Way globular clusters
- Modeling the Formation of Globular Cluster Systems in the Virgo Cluster
- Reconstructing Galaxy Histories from Globular Clusters
- Dynamical Evolution of Globular Clusters in Hierarchical Cosmology
- Multiple stellar populations in the Galactic globular cluster NGC 6752
- Formation versus destruction: the evolution of the star cluster population in galaxy mergers
- Constraining Globular Cluster Formation Through Studies of Young Massive Clusters: I. A lack of ongoing star formation within young clusters
- Formation of Globular Cluster Candidates in Merging Proto-galaxies at High Redshift: A View from the FIRE Cosmological Simulations
- Non-equilibrium chemistry and cooling in the diffuse interstellar medium - I. Optically thin regime
- The effect of dust cooling on low-metallicity star-forming clouds
- Supernova Feedback and the Hot Gas Filling Fraction of the Interstellar Medium
- The primordial and evolutionary abundance variations in globular-cluster stars: a problem with two unknowns
- Resolving Globular Cluster Formation within a Cosmological Context
- The difference in metallicity distribution functions of halo stars and globular clusters as a function of galaxy type: A tracer of globular cluster formation and evolution
- Molecular cooling in the diffuse interstellar medium
- The SLUGGS survey: inferring the formation epochs of metal-poor and metal-rich globular clusters
- Keck Spectroscopy of Globular Clusters in the Elliptical Galaxy NGC 3610
- Globular Cluster Systems and their Host Galaxies: Comparison of Spatial Distributions and Colors
- Formation of Compact Stellar Clusters by High-Redshift Galaxy Outflows III: Observability and Connection to Halo Globular Clusters