The fragmentation of expanding shells I: Limitations of the thin--shell approximation

Details The fragmentation of expanding shells I: Limitations of the thin--shell approximation The fragmentation of expanding shells I: Limitations of the thin--shell approximation

2009-06-09

arxiv.org/abs/0906.1670v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

13 pages, 10 figures, accepted by MNRAS

Scientific paper

We investigate the gravitational fragmentation of expanding shells in the context of the linear thin--shell analysis. We make use of two very different numerical schemes; the FLASH Adaptive Mesh Refinement code and a version of the Benz Smoothed Particle Hydrodynamics code. We find that the agreement between the two codes is excellent. We use our numerical results to test the thin--shell approximation and we find that the external pressure applied to the shell has a strong effect on the fragmentation process. In cases where shells are not pressure--confined, the shells thicken as they expand and hydrodynamic flows perpendicular to the plane of the shell suppress fragmentation at short wavelengths. If the shells are pressure--confined internally and externally, so that their thickness remains approximately constant during their expansion, the agreement with the analytical solution is better.

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