Environmental Dependence of the Kennicutt-Schmidt Relation in Galaxies

Gnedin, Nickolay Y.; Kravtsov, Andrey V.

doi:10.1088/0004-637X/728/2/88

Title: Environmental Dependence of the Kennicutt-Schmidt Relation in Galaxies

Journal Article · Thu Apr 01 00:00:00 EDT 2010 · Astrophys.J.

DOI:https://doi.org/10.1088/0004-637X/728/2/88· OSTI ID:1969308

Gnedin, Nickolay Y. ^[1];

^[2]

Fermilab; Chicago U.
Chicago U.; Chicago U., EFI

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 approach allows us to avoid the arbitrary density and temperature thresholds typically used in star formation recipes. We present results of the model based on realistic cosmological simulations of high-z galaxy formation for a grid of numerical models with varied dust-to-gas ratios and interstellar far UV (FUV) fluxes. Our results show that both the atomic-to-molecular transition on small, ~10 pc scales and the Kennicutt-Schmidt (KS) relation on ~kpc scales are sensititive to the dust-to-gas ratio and the FUV flux. The atomic-to-molecular transition as a function of gas density or column density has a large scatter but is rather sharp and shifts to higher densities with decreasing dust-to-gas ratio and/or increasing FUV flux. Consequently, star formation is concentrated to higher gas surface density regions, resulting in steeper slope and lower amplitude of the KS relation at a given gas surface density, in less dusty and/or higher FUV flux environments. These trends should have a particularly strong effect on the evolution of low-mass, low surface brightness galaxies which typically have low dust content and anemic star formation, but are also likely to be important for evolution of the Milky Way-sized systems. We parameterize the dependencies observed in our simulations in convenient fitting formulae, which can be used to model the dependence of the KS relation on the dust-to-gas ratio and FUV flux in semi-analytic models and in cosmological simulations that do not include radiative transfer and H2 formation.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1969308

Report Number(s):: FERMILAB-PUB-10-491-A; arXiv:1004.0003; oai:inspirehep.net:850549

Journal Information:: Astrophys.J., Vol. 728

Country of Publication:: United States

Language:: English

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