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Do random velocity fields inhibit or induce gravitational collapse and fragmentation?

Published online by Cambridge University Press:  03 August 2017

Philippe Chantry ,
Roland Grappin  and
Jacques Léorat
Philippe Chantry
Affiliation:
Observatoire de Meudon, DAEC, 92190 Meudon - France E—mail [email protected]
Roland Grappin
Affiliation:
Observatoire de Meudon, DAEC, 92190 Meudon - France E—mail [email protected]
Jacques Léorat
Affiliation:
Observatoire de Meudon, DAEC, 92190 Meudon - France E—mail [email protected]

Extract

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Recent numerical works on self-gravitating turbulence (Bonazzola et al., 1987; Léorat, Passot, Pouquet 1990) tend to show that turbulent velocity fields could act as a “turbulent” pressure, i.e. inhibit the collapse of self-gravitating clouds. This effect is efficient when the caracteristic scale of the turbulent flow is small compared to the Jeans's length. When these two scales are comparable, we show (Chantry, Grappin, Léorat, 1990) that the turbulence do no more inhibit the collapse, but seems to trigger it.

Type
Poster Sessions
Information
Symposium - International Astronomical Union , Volume 147: Fragmentation of Molecular Clouds and Star Formation , 1991 , pp. 396 - 397
Copyright
Copyright © Kluwer 1991 

References

Bonazzola, S., Falgarone, E., Heyvaerts, J., Pérault, M. and Puget, J.-L.: 1987, “Jeans collapse in a turbulent medium.” Astron. Astrophys., 172, 293–298 Google Scholar
Chantry, P., Grappin, R. and Léorat, J.: 1990, in preparation.Google Scholar
Léorat, J., Passot, T. and Pouquet, A.: 1990, “Influence of supersonic turbulence on self-gravitating flows.” Mon. Not R. astr. Soc., 243, 293–311 Google Scholar
Sasao, T.: 1973, “On the generation of density fluctuation due to turbulence in self-gravitating media.” Publ. Astron. Soc. Japan, 25, 1–33 Google Scholar