Great Balls of FIRE I: The formation of star clusters across cosmic time in a Milky Way-mass galaxy

Abstract

The properties of young star clusters formed within a galaxy are thought to vary in different interstellar medium (ISM) conditions, but the details of this mapping from galactic to cluster scales are poorly understood due to the large dynamic range involved in galaxy and star cluster formation. We introduce a new method for modeling cluster formation in galaxy simulations: mapping giant molecular clouds (GMCs) formed self-consistently in a FIRE-2 MHD galaxy simulation onto a cluster population according to a GMC-scale cluster formation model calibrated to higher-resolution simulations, obtaining detailed properties of the galaxy's star clusters in mass, metallicity, space, and time. We find $\sim 10\%$ of all stars formed in the galaxy originate in gravitationally-bound clusters overall, and this fraction increases in regions with elevated ${\Sigma }_{\mathrm{gas}}$ and ${\Sigma }_{\mathrm{SFR}}$, because such regions host denser GMCs with higher star formation efficiency. These quantities vary systematically over the history of the galaxy, driving variations in cluster formation. The mass function of bound clusters varies -- no single Schechter-like or power-law distribution applies at all times. In the most extreme episodes, clusters as massive as $7\times 10^6{M}_{\odot }$ form in massive, dense clouds with high star formation efficiency. The initial mass-radius relation of young star clusters is consistent with an environmentally-dependent 3D density that increases with ${\Sigma }_{\mathrm{gas}}$ and ${\Sigma }_{\mathrm{SFR}}$. The model does not reproduce the age and metallicity statistics of old ($>11\mathrm{Gyr}$) globular clusters found in the Milky Way, possibly because it forms stars more slowly at $z>3$.

Accepted to MNRAS

References in corpus (44)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The Resolved Properties of Extragalactic Giant Molecular Clouds
• A comprehensive set of simulations studying the influence of gas expulsion on star cluster evolution
• The lifecycle of molecular clouds in nearby star-forming disc galaxies
• Star cluster disruption by giant molecular clouds
• Kraken reveals itself -- the merger history of the Milky Way reconstructed with the E-MOSAICS simulations
• Before the first supernova: combined effects of HII regions and winds on molecular clouds
• Legacy ExtraGalactic UV Survey (LEGUS) with The Hubble Space Telescope. I. Survey Description
• On the Star Formation Rate - Brightest Cluster Relation: Estimating the peak SFR in post-merger galaxies
• STARFORGE: Toward a comprehensive numerical model of star cluster formation and feedback
• Probing the role of the galactic environment in the formation of stellar clusters; using M83 as a test bench
• Star cluster formation in cosmological simulations. I. Properties of young clusters
• The E-MOSAICS project: tracing galaxy formation and assembly with the age-metallicity distribution of globular clusters
• Star clusters near and far; tracing star formation across cosmic time
• Star Formation Efficiency and Dispersal of Giant Molecular Clouds with UV Radiation Feedback: Dependence on Gravitational Boundedness and Magnetic Fields
• Disruption of giant molecular clouds and formation of bound star clusters under the influence of momentum stellar feedback
• Radii of Young Star Clusters in Nearby Galaxies
• A model for the formation of stellar associations and clusters from giant molecular clouds
• The Formation Times and Building Blocks of Milky Way-mass Galaxies in the FIRE Simulations
• Self-consistent simulations of Nuclear Cluster formation through Globular Cluster orbital decay and merging
• STARFORGE: The effects of protostellar outflows on the IMF
• The formation of low metallicity globular clusters in dwarf galaxy mergers
• Star cluster formation in the most extreme environments: Insights from the HiPEEC survey
• PHAT Stellar Cluster Survey. II. Andromeda Project Cluster Catalog
• Not all stars form in clusters - measuring the kinematics of OB associations with $Gaia$
• The Young Star Cluster population of M51 with LEGUS: I. A comprehensive study of cluster formation and evolution
• Radiation hydrodynamics simulations of massive star cluster formation in giant molecular clouds
• Sizes and Shapes of Young Star Cluster Light Profiles in M83
• Star Cluster Catalogs for the LEGUS Dwarf Galaxies
• GW190412 as a Third-Generation Black Hole Merger from a Super Star Cluster
• Live Fast, Die Young: GMC lifetimes in the FIRE cosmological simulations of Milky Way-mass galaxies
• 3-D gas-phase elemental abundances across the formation histories of Milky Way-mass galaxies in the FIRE simulations: initial conditions for chemical tagging
• Globular Clusters and Dark Satellite Galaxies through the Stream Velocity
• Pressure balance in the multiphase ISM of cosmologically simulated disk galaxies
• The Single-Cloud Star Formation Relation
• The Mass-Size Relation and the Constancy of GMC Surface Densities in the Milky Way
• Evolution of giant molecular clouds across cosmic time
• The effects of subgrid models on the properties of giant molecular clouds in galaxy formation simulations
• Simulating radiative feedback and star cluster formation in GMCs: II. Mass dependence of cloud destruction and cluster properties
• The challenge of simulating the star cluster population of dwarf galaxies with resolved interstellar medium
• Can magnetized turbulence set the mass scale of stars?
• The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). III. The Mass Function of Young Star Clusters in M33
• On the initial mass-radius relation of stellar clusters
• Star Cluster Formation and Destruction in the Merging Galaxy NGC 3256

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• What Causes The Formation of Disks and End of Bursty Star Formation?
• Formation of star clusters and enrichment by massive stars in simulations of low-metallicity galaxies with a fully sampled initial stellar mass function
• Star Cluster Formation and Survival in the First Galaxies
• Fraction of Stars in Clusters for the LEGUS Dwarf Galaxies
• Stellar cluster formation in a Milky Way-sized galaxy at z>4 -- I. The proto-globular cluster population and the imposter amongst us
• Globular cluster metallicity distributions in the E-MOSAICS simulations
• The Supersonic Project: The Early Evolutionary Path of SIGOs