期刊
ASTRONOMY & ASTROPHYSICS
卷 590, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201628158
关键词
astrochemistry; molecular processes; galaxies: ISM; methods: numerical; evolution
资金
- DFG [Schwerpunktprogram SPP 1573, BO 4113/1-2, SCHL 1964/1-2, BA 3706/3-2]
- Danish National Research Foundation
- Deutsche Forschungsgemeinschaft (DFG) [Sonderforschungsbereiche (SFB) 963]
- Tomalla Foundation
Aims. We present and test chemical models for three-dimensional hydrodynamical simulations of galaxies. We explore the effect of changing key parameters such as metallicity, radiation, and non-equilibrium versus equilibrium metal cooling approximations on the transition between the gas phases in the interstellar medium. Methods. The microphysics was modelled by employing the public chemistry package KROME, and the chemical networks were tested to work in a wide range of densities and temperatures. We describe a simple H/He network following the formation of H-2 and a more sophisticated network that includes metals. Photochemistry, thermal processes, and different prescriptions for the H-2 catalysis on dust are presented and tested within a one-zone framework. The resulting network is made publicly available on the KROME webpage. Results. We find that employing an accurate treatment of the dust-related processes induces a faster HI-H-2 transition. In addition, we show when the equilibrium assumption for metal cooling holds and how a non-equilibrium approach affects the thermal evolution of the gas and the HII-HI transition. Conclusions. These models can be employed in any hydrodynamical code via an interface to KROME and can be applied to different problems including isolated galaxies, cosmological simulations of galaxy formation and evolution, supernova explosions in molecular clouds, and the modelling of star-forming regions. The metal network can be used for a comparison with observational data of CII 158 mu m emission both for high-redshift and for local galaxies.
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