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- W2564358711 abstract "We continue to investigate the dynamics of collisionless systems of particles interacting via additive $r^{-alpha}$ interparticle forces. Here we focus on the dependence of the radial-orbit instability on the force exponent $alpha$. By means of direct $N$-body simulations we study the stability of equilibrium radially anisotropic Osipkov-Merritt spherical models with Hernquist density profile and with $1leqalpha<3$. We determine, as a function of $alpha$, the minimum value for stability of the anisotropy radius $r_{as}$ and of the maximum value of the associated stability indicator $xi_s$. We find that, for decreasing $alpha$, $r_{as}$ decreases and $xi_s$ increases, i.e. longer-range forces are more robust against radial-orbit instability. The isotropic systems are found to be stable for all the explored values of $alpha$. The end products of unstable systems are all markedly triaxial with minor-to-major axial ratio $>0.3$, so they are never flatter than an E7 system." @default.
- W2564358711 created "2017-01-06" @default.
- W2564358711 creator A5055254581 @default.
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- W2564358711 date "2017-03-15" @default.
- W2564358711 modified "2023-09-25" @default.
- W2564358711 title "Radially anisotropic systems with r−α forces – II: radial-orbit instability" @default.
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- W2564358711 doi "https://doi.org/10.1093/mnras/stx600" @default.
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