Globular cluster metallicity distributions in the E-MOSAICS simulations

Abstract

The metallicity distributions of globular cluster (GC) systems in galaxies are a critical test of any GC formation scenario. In this work, we investigate the predicted GC metallicity distributions of galaxies in the MOdelling Star cluster population Assembly In Cosmological Simulations within EAGLE (E-MOSAICS) simulation of a representative cosmological volume ($L=34.4$ comoving Mpc). We find that the predicted GC metallicity distributions and median metallicities from the fiducial E-MOSAICS GC formation model agree well the observed distributions, except for galaxies with masses $M_{\ast }\sim 2\times 10^{10}$ M${}_{\odot }$, which contain an overabundance of metal-rich GCs. The predicted fraction of galaxies with bimodal GC metallicity distributions ($37\pm 2$ per cent in total; $45\pm 7$ per cent for $M_{\ast }>10^{10.5}$ M${}_{\odot }$) is in good agreement with observed fractions ($44_{-9}^{+10}$ per cent), as are the mean metallicities of the metal-poor and metal-rich peaks. We show that, for massive galaxies ($M_{\ast }>10^{10}$ M${}_{\odot }$), bimodal GC distributions primarily occur as a result of cluster disruption from initially-unimodal distributions, rather than as a result of cluster formation processes. Based on the distribution of field stars with GC-like abundances in the Milky Way, we suggest that the bimodal GC metallicity distribution of Milky Way GCs also occurred as a result of cluster disruption, rather than formation processes. We conclude that separate formation processes are not required to explain metal-poor and metal-rich GCs, and that GCs can be considered as the surviving analogues of young massive star clusters that are readily observed to form in the local Universe today.

19 pages, 16 figures. Published in MNRAS

References in corpus (42)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• The effect of photo-ionization on the cooling rates of enriched, astrophysical plasmas
• Chemical enrichment in cosmological, smoothed particle hydrodynamics simulations
• Evolution of asymptotic giant branch stars I. Updated synthetic TP-AGB models and their basic calibration
• The ACS Virgo Cluster Survey. XII. The Luminosity Function of Globular Clusters in Early Type Galaxies
• Star cluster disruption by giant molecular clouds
• On the Star Formation Rate - Brightest Cluster Relation: Estimating the peak SFR in post-merger galaxies
• A chronicle of galaxy mass assembly in the EAGLE simulation
• Morphology and star formation in IllustrisTNG: the build-up of spheroids and discs
• Explaining the Color Distributions of Globular Cluster Systems in Elliptical Galaxies
• Lifetimes of tidally limited star clusters with different radii
• 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
• High-resolution simulations of galaxy mergers: Resolving globular cluster formation
• The origin of the Milky Way globular clusters
• Modeling the Formation of Globular Cluster Systems in the Virgo Cluster
• Super Star Cluster Velocity Dispersions and Virial Masses in the M82 Nuclear Starburst
• The GRIFFIN project -- Formation of star clusters with individual massive stars in a simulated dwarf galaxy starburst
• A 2dF spectroscopic study of globular clusters in NGC 5128: Probing the formation history of the nearest giant Elliptical
• Halo globular clusters observed with AAOmega: dark matter content, metallicity and tidal heating
• The Accreted Nuclear Clusters of the Milky Way
• A Common Origin for Globular Clusters and Ultra-faint Dwarfs in Simulations of the First Galaxies
• Formation histories of stars, clusters and globular clusters in the E-MOSAICS simulations
• Globular Cluster Systems in Brightest Cluster Galaxies. III: Beyond Bimodality
• An EAGLE's View of Ex-situ Galaxy Growth
• The origin of globular cluster systems from cosmological simulations
• Clues on the Missing Sources of Reionization from Self-consistent Modeling of Milky Way and Dwarf Galaxy Globular Clusters
• Introducing EMP-Pathfinder: modelling the simultaneous formation and evolution of stellar clusters in their host galaxies
• Purveyors of fine halos: Re-assessing globular cluster contributions to the Milky Way halo build-up with SDSS-IV
• 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
• The minimum metallicity of globular clusters and its physical origin -- implications for the galaxy mass-metallicity relation and observations of proto-globular clusters at high redshift
• Great Balls of FIRE I: The formation of star clusters across cosmic time in a Milky Way-mass galaxy
• The SLUGGS survey: Globular cluster stellar population trends from weak absorption lines in stacked spectra
• Where did the globular clusters of the Milky Way form? Insights from the E-MOSAICS simulations
• The [α/Fe]-[Fe/H] relation in the E-MOSAICS simulations: its connection to the birth place of globular clusters and the fraction of globular cluster field stars in the bulge
• Linking globular cluster formation at low and high redshift through the age-metallicity relation in E-MOSAICS
• The SLUGGS survey: combining stars, globular clusters and planetary nebulae to understand the assembly history of early-type galaxies from their large radii kinematics
• New Constraints on Early-Type Galaxy Assembly from Spectroscopic Metallicities of Globular Clusters in M87
• The physics governing the upper truncation mass of the globular cluster mass function
• A Search for Intergalactic Globular Clusters in the Local Group

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