Three-phase Interstellar Medium in Galaxies Resolving Evolution with Star Formation and Supernova Feedback (TIGRESS): Algorithms, Fiducial Model, and Convergence

By Chang-Goo Kim, E. Ostriker. 2016

150 citations recorded by the source corpus.

We introduce TIGRESS, a novel framework for multi-physics numerical simulations of the star-forming interstellar medium (ISM) implemented in the Athena MHD code. The algorithms of TIGRESS are designed to spatially and temporally resolve key physical features, including: (1) the gravitational collapse and ongoing accretion of gas that leads to star formation in clusters; (2) the explosions of supernovae (SNe), both near their progenitor birth sites and from runaway OB stars, with time delays relative to star formation determined by population synthesis; (3) explicit evolution of SN remnants prior to the onset of cooling, which leads to the creation of the hot ISM; (4) photoelectric heating of the warm and cold phases of the ISM that tracks the time-dependent ambient FUV field from the young cluster population; (5) large-scale galactic differential rotation, which leads to epicyclic motion and shears out overdense structures, limiting large-scale gravitational collapse; (6) accurate evolution of magnetic fields, which can be important for vertical support of the ISM disk as well as angular momentum transport. We present tests of the newly implemented physics modules, and demonstrate application of TIGRESS in a fiducial model representing the solar neighborhood environment. We use a resolution study to demonstrate convergence and evaluate the minimum resolution Δ x required to correctly recover several ISM properties, including the star formation rate, wind mass-loss rate, disk scale height, turbulent and Alfvénic velocity dispersions, and volume fractions of warm and hot phases. For the solar neighborhood model, all these ISM properties are converged at Δ x ≤ 8 pc .

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/298ade862ed4137dcf568ee02104e749b5d2b444

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In Astronomy and Astrophysics

Citations in the corpus

First results from the TNG50 simulation: galactic outflows driven by supernovae and black hole feedback (2019, background): “At small scales there are many idealized studies aimed at understanding the details of supernova-driven wind launching mechanisms (Girichidis et al. 2016; Fielding et al. 2017; Kim & Ostriker 2017) or detailed phase-interaction physics (Richings & FaucherGiguère 2018; Schneider & Robertson 2018).”
FIRE-2 simulations: physics versus numerics in galaxy formation (2017, background): “…star formation (both rates and spatial distribution) requires the ability to resolve at least the existence and self-gravity of the largest self-gravitating gas structures (i.e. fragmentation) in a galactic disk (see Saitoh et al. 2008; Hopkins et al. 2011, 2012c,b, 2014; Kim & Ostriker 2017).”