期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 398, 期 3, 页码 1537-1548出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15213.x
关键词
stars: formation; H II regions
资金
- University of Chicago
- European Community [MEIF-CT-2006-039802]
- European Commission [MRTN-CT-2006-035890]
- Academy of Sciences of the Czech Republic [AV0Z10030501]
- Ministry of Educatio, Youth and Sports of the Czech Republic [LC06014]
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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