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Title: Nonuniversal star formation efficiency in turbulent ISM

Journal Article · · The Astrophysical Journal (Online)

Here, we present a study of a star formation prescription in which star formation efficiency depends on local gas density and turbulent velocity dispersion, as suggested by direct simulations of SF in turbulent giant molecular clouds (GMCs). We test the model using a simulation of an isolated Milky Way-sized galaxy with a self-consistent treatment of turbulence on unresolved scales. We show that this prescription predicts a wide variation of local star formation efficiency per free-fall time, $$\epsilon_{\rm ff} \sim 0.1 - 10\%$$, and gas depletion time, $$t_{\rm dep} \sim 0.1 - 10$$ Gyr. In addition, it predicts an effective density threshold for star formation due to suppression of $$\epsilon_{\rm ff}$$ in warm diffuse gas stabilized by thermal pressure. We show that the model predicts star formation rates in agreement with observations from the scales of individual star-forming regions to the kiloparsec scales. This agreement is non-trivial, as the model was not tuned in any way and the predicted star formation rates on all scales are determined by the distribution of the GMC-scale densities and turbulent velocities $$\sigma$$ in the cold gas within the galaxy, which is shaped by galactic dynamics. The broad agreement of the star formation prescription calibrated in the GMC-scale simulations with observations, both gives credence to such simulations and promises to put star formation modeling in galaxy formation simulations on a much firmer theoretical footing.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1333137
Report Number(s):
arXiv:1512.03101; FERMILAB-PUB-16-503-A; 1495139
Journal Information:
The Astrophysical Journal (Online), Vol. 826, Issue 2; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 87 works
Citation information provided by
Web of Science

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Cited By (36)

Fast and inefficient star formation due to short-lived molecular clouds and rapid feedback journal May 2019
G.A.S.: I. A prescription for turbulence-regulated star formation and its impact on galaxy properties journal July 2019
The [C ii]–SFR correlation in dwarf galaxies across cosmic time journal January 2020
What drives gravitational instability in nearby star-forming spirals? The impact of CO and H i velocity dispersions journal April 2017
An uncertainty principle for star formation – II. A new method for characterizing the cloud-scale physics of star formation and feedback across cosmic history journal May 2018
What FIREs up star formation: the emergence of the Kennicutt–Schmidt law from feedback journal May 2018
FIRE-2 simulations: physics versus numerics in galaxy formation journal June 2018
Modelling turbulent effects of stellar feedback in cosmological simulations journal November 2018
Dynamic localized turbulent diffusion and its impact on the galactic ecosystem journal December 2018
On the observed diversity of star formation efficiencies in Giant Molecular Clouds journal May 2019
Forming early-type galaxies without AGN feedback: a combination of merger-driven outflows and inefficient 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
The Role of Magnetic Fields in Setting the Star Formation Rate and the Initial Mass Function journal February 2019
Observational Evidence of Dynamic star Formation rate in Milky way Giant Molecular Clouds journal December 2016
Star Cluster Formation in Cosmological Simulations. i. Properties of Young Clusters journal January 2017
On the Appearance of Thresholds in the Dynamical Model of Star Formation journal February 2018
Dense Regions in Supersonic Isothermal Turbulence journal February 2018
Star Cluster Formation in Cosmological Simulations. II. Effects of Star Formation Efficiency and Stellar Feedback journal July 2018
The Fate of Supernova-heated Gas in Star-forming Regions of the LMC: Lessons for Galaxy Formation? journal August 2018
What Sets the Slope of the Molecular Kennicutt–Schmidt Relation? journal January 2019
Dancing in the Dark: Uncertainty in Ultrafaint Dwarf Galaxy Predictions from Cosmological Simulations journal March 2019
How Galactic Environment Affects the Dynamical State of Molecular Clouds and Their Star Formation Efficiency journal September 2019
What FIREs up star formation: the emergence of the Kennicutt–Schmidt law from feedback text January 2018
Forming early-type galaxies without AGN feedback: a combination of merger-driven outflows and inefficient star formation text January 2020
FIRE-2 simulations: physics versus numerics in galaxy formation text January 2018
Observational Evidence of Dynamic Star Formation Rate in Milky Way Giant Molecular Clouds text January 2016
What drives gravitational instability in nearby star-forming spirals? The impact of CO and HI velocity dispersions text January 2017
Star Cluster Formation in Cosmological Simulations. II. Effects of Star Formation Efficiency and Stellar Feedback text January 2017
On the Appearance of Thresholds in the Dynamical Model of Star Formation text January 2018
Globular Cluster Formation and Evolution in the Context of Cosmological Galaxy Assembly: Open Questions text January 2018
The Fate of Supernova-Heated Gas in Star-Forming Regions of the LMC: Lessons for Galaxy Formation? text January 2018
An uncertainty principle for star formation - II. A new method for characterising the cloud-scale physics of star formation and feedback across cosmic history text January 2018
The [CII]--SFR correlation in dwarf galaxies across cosmic time text January 2019
Fast and inefficient star formation due to short-lived molecular clouds and rapid feedback text January 2019
Forming early-type galaxies without AGN feedback: a combination of merger-driven outflows and inefficient star formation text January 2019

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