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• W2793057178 abstract "As part of our long-term campaign to understand how cold streams feed massive galaxies at high redshift, we study the Kelvin–Helmholtz instability (KHI) of a supersonic, cold, dense gas stream as it penetrates through a hot, dilute circumgalactic medium (CGM). A linear analysis (Paper I) showed that, for realistic conditions, KHI may produce non-linear perturbations to the stream during infall. Therefore, we proceed here to study the non-linear stage of KHI, still limited to a 2D slab with no radiative cooling or gravity. Using analytic models and numerical simulations, we examine stream break-up, deceleration, and heating via surface modes and body modes. The relevant parameters are the density contrast between stream and CGM (δ), the Mach number of the stream velocity with respect to the CGM (Mb) and the stream radius relative to the halo virial radius (Rs/Rv). We find that sufficiently thin streams disintegrate prior to reaching the central galaxy. The condition for break-up ranges from Rs < 0.03Rv for (Mb ∼ 0.75, δ ∼ 10) to Rs < 0.003Rv for (Mb ∼ 2.25, δ ∼ 100). However, due to the large stream inertia, KHI has only a small effect on the stream inflow rate and a small contribution to heating and subsequent Lyman-α cooling emission." @default.
• W2793057178 created "2018-03-29" @default.
• W2793057178 creator A5008335370 @default.
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• W2793057178 creator A5058805164 @default.
• W2793057178 date "2018-03-24" @default.
• W2793057178 modified "2023-10-15" @default.
• W2793057178 title "Instability of supersonic cold streams feeding galaxies–II. Non-linear evolution of surface and body modes of Kelvin–Helmholtz instability" @default.
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• W2793057178 doi "https://doi.org/10.1093/mnras/sty789" @default.
• W2793057178 hasPublicationYear "2018" @default.
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