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Title: Star cluster formation in cosmological simulations. I. Properties of young clusters

Journal Article · · The Astrophysical Journal (Online)
ORCiD logo [1];  [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [4]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States); Peking Univ., Beijing (China)
  4. Univ. of Chicago, Chicago, IL (United States)

We present a new implementation of star formation in cosmological simulations by considering star clusters as a unit of star formation. Cluster particles grow in mass over several million years at the rate determined by local gas properties, with high time resolution. The particle growth is terminated by its own energy and momentum feedback on the interstellar medium. We test this implementation for Milky Way-sized galaxies at high redshift by comparing the properties of model clusters with observations of young star clusters. We find that the cluster initial mass function is best described by a Schechter function rather than a single power law. In agreement with observations, at low masses the logarithmic slope is $$\alpha \approx 1.8\mbox{–}2$$, while the cutoff at high mass scales with the star formation rate (SFR). A related trend is a positive correlation between the surface density of the SFR and fraction of stars contained in massive clusters. Both trends indicate that the formation of massive star clusters is preferred during bursts of star formation. These bursts are often associated with major-merger events. We also find that the median timescale for cluster formation ranges from 0.5 to 4 Myr and decreases systematically with increasing star formation efficiency. Local variations in the gas density and cluster accretion rate naturally lead to the scatter of the overall formation efficiency by an order of magnitude, even when the instantaneous efficiency is kept constant. As a result, comparison of the formation timescale with the observed age spread of young star clusters provides an additional important constraint on the modeling of star formation and feedback schemes.

Research Organization:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1365574
Report Number(s):
arXiv:1608.03244; FERMILAB-PUB-16-688-A; 1602906
Journal Information:
The Astrophysical Journal (Online), Vol. 834, Issue 1; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 77 works
Citation information provided by
Web of Science

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Planck 2015 results : X. Diffuse component separation: Foreground maps journal September 2016
Rapid star formation and global gravitational collapse text January 2012
The Large-Scale Structure of the Universe journal October 1983
Planck 2015 results : XXVI. The Second journal September 2016
Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints text January 2008
Modeling Collapse and Accretion in Turbulent Gas Clouds: Implementation and Comparison of Sink Particles in AMR and SPH text January 2010
Modeling the Metallicity Distribution of Globular Clusters text January 2010
Young massive star clusters text January 2010
On the Fraction of Star Clusters Surviving the Embedded Phase text January 2010
Environmental Dependence of the Kennicutt-Schmidt Relation in Galaxies text January 2010
On the Star Formation Rates in Molecular Clouds text January 2010
On the time variability of the star formation efficiency text January 2010
Implementing the DC Mode in Cosmological Simulations with Supercomoving Variables text January 2011
The Average Star Formation Histories of Galaxies in Dark Matter Halos from z=0-8 text January 2012
A Simple Law of Star Formation text January 2012
The Star Formation Rate of Turbulent Magnetized Clouds: Comparing Theory, Simulations, and Observations text January 2012
Analytical theory for the initial mass function: III time dependence and star formation rate text January 2013
A supersonic turbulence origin of Larson's laws text January 2013
Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation text January 2013
Cosmic Reionization On Computers I. Design and Calibration of Simulations text January 2014
Modeling the Formation of Globular Cluster Systems in the Virgo Cluster text January 2014
Globular cluster formation in the context of galaxy formation and evolution text January 2014
Using Galaxy Pairs to Probe Star Formation During Major Halo Mergers text January 2015
Planck 2015 results. XIII. Cosmological parameters text January 2015
Studying the YMC population of M83: how long clusters remain embedded, their interaction with the ISM and implications for GC formation theories text January 2015
Inefficient star formation through turbulence, magnetic fields and feedback text January 2015
Cosmological Galaxy Evolution with Superbubble Feedback I: Realistic Galaxies with Moderate Feedback text January 2015
Probing the role of the galactic environment in the formation of stellar clusters; using M83 as a test bench text January 2015
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The star cluster mass--galactocentric radius relation: Implications for cluster formation text January 2015
Non-universal star formation efficiency in turbulent ISM text January 2015
On the variation of the Initial Mass Function text January 2000
Multi--dimensional Cosmological Radiative Transfer with a Variable Eddington Tensor Formalism text January 2001
On the Origin of the Global Schmidt Law of Star Formation text January 2003
The luminosity function of young star clusters: implications for the maximum mass and luminosity of clusters text January 2005
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Cited By (48)

Cosmological simulations of galaxy formation journal January 2020
Study of gravitational fields and globular cluster systems of early-type galaxies journal May 2019
Supermassive black holes in the early universe journal April 2019
Formation of globular cluster candidates in merging proto-galaxies at high redshift: a view from the FIRE cosmological simulations journal November 2017
The E-MOSAICS project: simulating the formation and co-evolution of galaxies and their star cluster populations journal December 2017
Concurrent formation of supermassive stars and globular clusters: implications for early self-enrichment journal April 2018
Slow cooling in low-metallicity clouds: an origin of globular cluster bimodality? journal May 2018
The origin of the ‘blue tilt’ of globular cluster populations in the E-MOSAICS simulations journal July 2018
Formation of globular cluster systems: from dwarf galaxies to giants journal July 2018
Globular clusters formed within dark haloes I: present-day abundance, distribution, and kinematics journal October 2018
Young massive clusters in the interacting LIRG Arp 299: evidence for the dependence of star cluster formation and evolution on environment journal October 2018
Massive star cluster formation under the microscope at z  = 6 journal December 2018
Star cluster formation in cosmological simulations – III. Dynamical and chemical evolution journal April 2019
Formation histories of stars, clusters, and globular clusters in the E-MOSAICS simulations journal May 2019
A systematic analysis of star cluster disruption by tidal shocks – I. Controlled N-body simulations and a new theoretical model journal May 2019
Disruption of giant molecular clouds and formation of bound star clusters under the influence of momentum stellar feedback journal May 2019
The evolution of the UV luminosity function of globular clusters in the E-MOSAICS simulations journal June 2019
Is there a fundamental upper limit to the mass of a star cluster? journal July 2019
Origins of scaling relations of globular cluster systems journal July 2019
Young star cluster populations in the E-MOSAICS simulations journal October 2019
Global simulations of galactic discs: violent feedback from clustered supernovae during bursts of star formation journal December 2019
Structure and stability of high-redshift galaxies in cosmological simulations journal March 2019
Globular cluster formation and evolution in the context of cosmological galaxy assembly: open questions
  • Forbes, Duncan A.; Bastian, Nate; Gieles, Mark
  • Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 474, Issue 2210 https://doi.org/10.1098/rspa.2017.0616
journal February 2018
Legacy ExtraGalactic UV Survey with The Hubble Space Telescope : Stellar Cluster Catalogs and First Insights Into Cluster Formation and Evolution in NGC 628 journal June 2017
Dissolved Massive Metal-rich Globular Clusters Can Cause the Range of UV Upturn Strengths Found among Early-type Galaxies journal April 2018
Globular Clusters in a Cosmological N -body Simulation journal July 2018
Resolved Star Formation Efficiency in the Antennae Galaxies journal August 2018
Star Cluster Formation in Cosmological Simulations. II. Effects of Star Formation Efficiency and Stellar Feedback journal July 2018
Cold Filamentary Accretion and the Formation of Metal-poor Globular Clusters and Halo Stars journal July 2018
Nuclear Star Clusters in Cosmological Simulations journal September 2018
Two Thresholds for Globular Cluster Formation and the Common Occurrence of Massive Clusters in the Early Universe journal December 2018
The SLUGGS survey: measuring globular cluster ages using both photometry and spectroscopy journal September 2019
The E-MOSAICS project: tracing galaxy formation and assembly with the age–metallicity distribution of globular clusters journal April 2019
Supermassive black holes in the early Universe journal December 2015
Panchromatic Hubble Andromeda Treasury. XVIII. The High-mass Truncation of the Star Cluster Mass Function journal April 2017
Supermassive black holes in the early universe journal March 2004
Legacy ExtraGalactic UV Survey with The Hubble Space Telescope. Stellar cluster catalogues and first insights into cluster formation and evolution in NGC 628 text January 2017
Globular Clusters in a Cosmological N-body Simulation text January 2017
Star Cluster Formation in Cosmological Simulations. II. Effects of Star Formation Efficiency and Stellar Feedback text January 2017
Globular Cluster Formation and Evolution in the Context of Cosmological Galaxy Assembly: Open Questions text January 2018
Dissolved Massive Metal-Rich Globular Clusters Can Cause the Range of UV Upturn Strengths Found among Early-type Galaxies text January 2018
Nuclear Star Clusters in Cosmological Simulations text January 2018
Massive Star cluster formation under the microscope at z=6 text January 2018
Young massive clusters in the interacting LIRG Arp 299: evidence for the dependence of star cluster formation and evolution on environment text January 2018
Star cluster formation in cosmological simulations. III. Dynamical and chemical evolution text January 2018
Disruption of giant molecular clouds and formation of bound star clusters under the influence of momentum stellar feedback text January 2019
Origins of scaling relations of globular cluster systems text January 2019
The evolution of the UV luminosity function of globular clusters in the E-MOSAICS simulations text January 2019

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