Vortices in thin, compressible, unmagnetized disks

被引:58
作者
Johnson, BM [1 ]
Gammie, CF [1 ]
机构
[1] Univ Illinois, Ctr Theoret Astrophys, Urbana, IL 61801 USA
关键词
accretion; accretion disks; galaxies : active; galaxies : nuclei; solar system : formation;
D O I
10.1086/497358
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider the formation and evolution of vortices in a hydrodynamic shearing-sheet model. The evolution is done numerically using a version of the ZEUS code. Consistent with earlier results, an injected vorticity field evolves into a set of long-lived vortices, each of which has a radial extent comparable to the local scale height. But we also find that the resulting velocity field has a positive shear stress, <Sigma delta(v)r delta v(phi)>. This effect appears only at high resolution. The transport, which decays with time as t(-1/2), arises primarily because the vortices drive compressive motions. This result suggests a possible mechanism for angular momentum transport in low-ionization disks, with two important caveats: a mechanism must be found to inject vorticity into the disk, and the vortices must not decay rapidly due to three-dimensional instabilities.
引用
收藏
页码:149 / 156
页数:8
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