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• W3100502435 endingPage "1293" @default.
• W3100502435 startingPage "1278" @default.
• W3100502435 abstract "Using high-resolution, two-dimensional hydrodynamic simulations, we investigate nonlinear gravitational responses of gas to, and the resulting drag force on, a very massive perturber Mp moving at velocity Vp through a uniform gaseous medium of adiabatic sound speed a∞. We model the perturber as a Plummer potential with softening radius rs, and run various models with differing and by imposing cylindrical symmetry with respect to the line of perturber motion. For supersonic cases, a massive perturber quickly develops nonlinear flows that produce a detached bow shock and a vortex ring, which is unlike in the linear cases where Mach cones are bounded by low-amplitude Mach waves. The flows behind the shock are initially non-steady, displaying quasi-periodic, overstable oscillations of the vortex ring and the shock. The vortex ring is eventually shed downstream and the flows evolve toward a quasi-steady state where the density wake near the perturber is in near hydrostatic equilibrium. We find that the detached shock distance δ and the nonlinear drag force F depend solely on such that δ/rs = η and for , where Flin is the linear drag force of Ostriker. The reduction of F compared with Flin is caused by front–back symmetry in the nonlinear density wakes. In subsonic cases, the flows without involving a shock do not readily reach a steady state. Nevertheless, the subsonic density wake near a perturber is close to being hydrostatic, resulting in the drag force similar to the linear case. Our results suggest that dynamical friction of a very massive object as in a merger of black holes near a galaxy center will take considerably longer than the linear prediction." @default.
• W3100502435 created "2020-11-23" @default.
• W3100502435 creator A5008549214 @default.
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• W3100502435 date "2009-09-08" @default.
• W3100502435 modified "2023-10-17" @default.
• W3100502435 title "NONLINEAR DYNAMICAL FRICTION IN A GASEOUS MEDIUM" @default.
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• W3100502435 doi "https://doi.org/10.1088/0004-637x/703/2/1278" @default.
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