A simulation of the collapse and fragmentation of cooling molecular clouds

Details A simulation of the collapse and fragmentation of cooling molecular clouds A simulation of the collapse and fragmentation of cooling molecular clouds

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...375..177m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 375, July 1, 1991, p. 177-189. NASA-supported research.

Statistics

Computation

70

Computational Astrophysics, Cooling, Fragmentation, Gravitational Collapse, Hydrodynamics, Interstellar Gas, Molecular Clouds, Algorithms, Carbon Monoxide, Computerized Simulation, Hydrogen, Maclaurin Series, Poisson Equation

Scientific paper

The application of the Smoothed Particle Hydrodynamics method to the fragmentation of rotating cloud and disk systems is described, allowing for molecular cooling due to H2 and CO. A novel approach to solving Poisson's equation for disklike structures which exploits the multigrid algorithm is also described. Numerical studies are presented which investigate the evolution of both rotating clouds and Maclaurin disks, in each case with both an isothermal equation of state and with molecular cooling. The results establish the influence of molecular cooling on the fragmentation of molecular clouds. The isothermal sequences, if they fragment at all, do so into far fewer lumps than the cooling sequences. This is not due to a cooling instability as such, but rather to the reduced thermal support. One of the sequences shows a remarkable similarity to the W49A star-forming region.

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