Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pthph..88..251y&link_type=abstract
Progress of Theoretical Physics, Vol. 88, No. 2, pp. 251-268.
Physics
15
Scientific paper
We have performed two-dimensional hydrodynamic calculations to investigate effect of deceleration on the gravitational instability of isothermal shocked gas layers. We give the time evolution of the decelerating shocked layer with the corrugation-type perturbation. Our numerical results show that the density perturbation is produced by the tangential flows caused by the corrugated shock front and by the effective gravity due to the deceleration and the gas pressure. The growth rate of the density perturbation and the evolution of the perturbation depend on the initial wavelength of the corrugation-type perturbation. We find that there is the most unstable wave number. In this case, the density perturbation grows well due to the decelerating shock instability in tcr, where it is the time that the self-gravity of the layer becomes equal to the deceleration of the layer. After tcr, the density perturbation continues to grow fast due to the gravitational instability. In this way, the deceleration accelerates the gravitational instability. The gravitational collapse occurs in a half of the free fall time tff of the preshock gas. On the other hand, if the density perturbation does not grow enough in tcr, the gravitational collapse occurs in tff or the gravitational collapse does not occur. We discuss the condition of the fast gravitational collapse. Our numerical results suggest that the deceleration of the dense layer in the molecular clouds formed by the H II regions accelerates the formation of the cores, which are observed in molecular clouds beside H II regions.
Habe Asao
Yoshida Tadashi
No associations
LandOfFree
Effect of Deceleration on the Gravitational Instability of Shocked Gas Layers does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effect of Deceleration on the Gravitational Instability of Shocked Gas Layers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of Deceleration on the Gravitational Instability of Shocked Gas Layers will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1168861