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Simulations, Data Analysis and Algorithms

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Table 2 Comparison of key model changes between Illustris and IllustrisTNG. For full details and a more comprehensive comparison including numerical parameter differences, see Table 1 of Pillepich et al. (2018b) and the two TNG methods papers in general

From: The IllustrisTNG simulations: public data release

Simulation Aspect Illustris TNG (50/100/300)
Magnetic Fields no ideal MHD (Pakmor et al. 2011)
BH Low-State Feedback ‘Radio’ Bubbles BH-driven wind (kinetic kick)
BH Accretion Boosted Bondi-Hoyle (α = 100) Un-boosted Bondi-Hoyle
BH Seed mass 105 M/h 8 × 105 M/h
Winds (Directionality) bi-polar (\(\vec{v}_{\mathrm{gas}} \times\nabla \phi _{\mathrm{grav}}\)) isotropic
Winds (Thermal Content) cold warm (10%)
Winds (Velocity) \(\propto\sigma_{\mathrm{DM}}\) + scaling with H(z), and \(v_{\min}\)
Winds (Energy) constant per unit SFR + metallicity dependence in η
Stellar Evolution Illustris Yields TNG Yields
Metals Tagging SNIa, SNII, AGB, NSNS, FeSNIa, FeSNII
Shock Finder no yes (Schaal and Springel 2015)