What Sets the Slope of the Molecular Kennicutt–Schmidt Relation?

@article{Semenov2019WhatST,
  title={What Sets the Slope of the Molecular Kennicutt–Schmidt Relation?},
  author={Vadim A. Semenov and Andrey V. Kravtsov and Nickolay Y. Gnedin},
  journal={The Astrophysical Journal},
  year={2019},
  volume={870}
}
The surface densities of molecular gas, , and the star formation rate (SFR), , correlate almost linearly on kiloparsec scales in observed star-forming (non-starburst) galaxies. We explore the origin of the linear slope of this correlation using a suite of isolated galaxy simulations. We show that in simulations with efficient feedback, the slope of the relation on kiloparsec scales is insensitive to the slope of the relation assumed at the resolution scale. We also find that the slope on… 

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References

SHOWING 1-10 OF 93 REFERENCES

What FIREs up star formation: The emergence of the Kennicutt-Schmidt law from feedback

We present an analysis of the global and spatially resolved Kennicutt–Schmidt (KS) star formation relation in the FIRE (Feedback In Realistic Environments) suite of cosmological simulations,

On the Appearance of Thresholds in the Dynamical Model of Star Formation

The Kennicutt–Schmidt (KS) relationship between the surface density of the star formation rate (SFR) and the gas surface density has three distinct power laws that may result from one model in which

The Relationship between Molecular Gas Tracers and Kennicutt-Schmidt Laws

We provide a model for how Kennicutt-Schmidt (KS) laws, which describe the correlation between star formation rate and gas surface or volume density, depend on the molecular line chosen to trace the

On the relation between the Schmidt and Kennicutt-Schmidt star formation laws and its implications for numerical simulations

When averaged over large scales, star formation in galaxies is observed to follow the empirical Kennicutt-Schmidt (KS) law for surface densities above a constant threshold. While the observed law

ENVIRONMENTAL DEPENDENCE OF THE KENNICUTT–SCHMIDT RELATION IN GALAXIES

We present a detailed description of a phenomenological H2 formation model and local star formation prescription based on the density of molecular (rather than total) gas. Such an approach allows us

On the Origin of the Global Schmidt Law of Star Formation

One of the most puzzling properties of observed galaxies is the universality of the empirical correlation between the star formation rate and the average gas surface density on kiloparsec scales (the

Star Formation Timescales and the Schmidt Law

We offer a simple parameterization of the rate of star formation in galaxies. In this new approach, we make explicit and decouple the timescales associated (1) with disruptive effects of the star

ON THE INTERPLAY BETWEEN STAR FORMATION AND FEEDBACK IN GALAXY FORMATION SIMULATIONS

We investigate the star formation–feedback cycle in cosmological galaxy formation simulations, focusing on the progenitors of Milky Way (MW)-sized galaxies. We find that in order to reproduce key

THE STATE OF THE GAS AND THE RELATION BETWEEN GAS AND STAR FORMATION AT LOW METALLICITY: THE SMALL MAGELLANIC CLOUD

We compare atomic gas, molecular gas, and the recent star formation rate (SFR) inferred from Hα in the Small Magellanic Cloud (SMC). By using infrared dust emission and local dust-to-gas ratios, we

A study of the gas–star formation relation over cosmic time

We use the first systematic data sets of CO molecular line emission in z∼ 1–3 normal star-forming galaxies (SFGs) for a comparison of the dependence of galaxy-averaged star formation rates on
...