Modelling H${}_2$ and its effects on star formation using a joint implementation of GADGET-3 and KROME

Abstract

We present P-GADGET3-K, an updated version of GADGET3, that incorporates the chemistry package KROME. P-GADGET3-K follows the hydrodynamical and chemical evolution of cosmic structures, incorporating the chemistry and cooling of H${}_2$ and metal cooling in non-equilibrium. We performed different runs of the same ICs to assess the impact of various physical parameters and prescriptions, namely gas metallicity, molecular hydrogen formation on dust, star formation recipes including or not H${}_2$ dependence, and the effects of numerical resolution. We find that the characteristics of the simulated systems, both globally and at kpc-scales, are in good agreement with several observable properties of molecular gas in star-forming galaxies. The surface density profiles of SFR and H${}_2$ are found to vary with the clumping factor and resolution. In agreement with previous results, the chemical enrichment of the gas component is found to be a key ingredient to model the formation and distribution of H${}_2$ as a function of gas density and temperature. A SF algorithm that takes into account the H${}_2$ fraction together with a treatment for the local stellar radiation field improves the agreement with observed H${}_2$ abundances over a wide range of gas densities and with the molecular Kennicutt-Schmidt law, implying a more realistic modelling of the star formation process.

21 pages, 16 figures. Accepted for publication in MNRAS

References in corpus (33)

• Theory of Star Formation
• The Role of Pressure in GMC Formation II: The H_2 - Pressure Relation
• xCOLD GASS: the complete IRAM-30m legacy survey of molecular gas for galaxy evolution studies
• Modelling discontinuities and Kelvin-Helmholtz instabilities in SPH
• Inviscid SPH
• Molecular Hydrogen and Global Star Formation Relations in Galaxies
• Fragmentation of star-forming clouds enriched with the first dust
• Uncertainties in H2 and HD Chemistry and Cooling and their Role in Early Structure Formation
• The relation between gas and dust in the Taurus Molecular Cloud
• Effects of Supernova Feedback on the Formation of Galaxy Disks
• Feedback and metal enrichment in cosmological SPH simulations - II. A multiphase model with supernova energy feedback
• Environmental Dependence of the Kennicutt-Schmidt Relation in Galaxies
• HI-to-H2 Transitions and H I Column Densities in Galaxy Star-Forming Regions
• Stellar Population gradients in galaxy discs from the CALIFA survey
• Star formation at very low metallicity. I: Chemistry and cooling at low densities
• Metal and molecule cooling in simulations of structure formation
• Metal and molecule cooling in simulations of structure formation
• A complete 12CO 2-1 map of M51 with HERA: I. Radial averages of CO, HI, and radio continuum
• Galaxy Simulation with Dust Formation and Destruction
• The impact of chemistry on the structure of high-z galaxies
• Chemical Rates on Small Grains and PAHs: C^+ Recombination and H_2 Formation
• Is H3+ cooling ever important in primordial gas?
• Non-equilibrium chemistry and cooling in the diffuse interstellar medium - II. Shielded gas
• HD and H2 formation in low-metallicity dusty gas clouds at high redshift
• The natural emergence of the correlation between H2 and star formation rate surface densities in galaxy simulations
• CO(1-0), CO(2-1) and Neutral Gas in NGC 6946: Molecular Gas in a Late-Type, Gas Rich, Spiral Galaxy
• Disk fragmentation and the formation of population III stars
• The effect of non-equilibrium metal cooling on the interstellar medium
• Simulating the H2 content of high-redshift galaxies
• Formation of carbon-enhanced metal-poor stars in the presence of far ultraviolet radiation
• Modelling the chemistry of star-forming filaments - II. Testing filament characteristics with synthetic observations
• Implementing Dust Shielding as a Criteria for Star Formation
• H${}_2$ formation on interstellar dust grains: the viewpoints of theory, experiments, models and observations