Papers › Spin-driven jet feedback in idealised simulations of galaxy groups and clusters
Spin-driven jet feedback in idealised simulations of galaxy groups and clusters
Filip Huško, Cedric G. Lacey, Joop Schaye, Matthieu Schaller, Folkert S. J. Nobels
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We implement a black hole spin evolution and jet feedback model into SWIFT, a smoothed particle hydrodynamics code. The jet power is determined self-consistently assuming Bondi accretion, using a realistic, spin-dependant efficiency. The jets are launched along the spin axis of the black hole, resulting in natural reorientation and precession. We apply the model to idealised simulations of galaxy groups and clusters, finding that jet feedback successfully quenches gas cooling and star formation in all systems. Our group-size halo (M₂₀₀=10¹³ M_⊙) is quenched by a strong jet episode triggered by a cooling flow, and it is kept quenched by a low-power jet fed from hot halo accretion. In more massive systems (M₂₀₀≥10¹⁴ M_⊙), hot halo accretion is insufficient to quench the galaxies, or to keep them quenched after the first cooling episode. These galaxies experience multiple episodes of gas cooling, star formation and jet feedback. In the most massive galaxy cluster that we simulate (M₂₀₀=10¹⁵ M_⊙), we find peak cold gas masses of 10¹⁰ M_⊙ and peak star formation rates of a few times 100 M_⊙yr⁻¹. These values are achieved during strong cooling flows, which also trigger the strongest jets with peak powers of 10⁴⁷ ergs⁻¹. These jets subsequently shut off the cooling flows and any associated star formation. Jet-inflated bubbles draw out low-entropy gas that subsequently forms dense cooling filaments in their wakes, as seen in observations.
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