Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..365k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 15, 1990, p. 365-369.
Astronomy and Astrophysics
Astronomy
4
Hydrodynamic Equations, Interstellar Gas, Molecular Clouds, Shock Wave Interaction, Two Dimensional Models, Gas Density, Gas Pressure, H Ii Regions, Perturbation Theory, Star Formation
Scientific paper
Results are reported from two-dimensional hydrodynamical calculations on the formation of high-density gas clumps behind a converging shock wave in a gas cloud. Consideration is given to a cylindrical gas cloud and a cylindrical shocked gas shell formed in the cloud, pushed by a surrounding high-pressure gas. Slight distortion is initially added to the gas shell, and its evolution is followed numerically. As the shell converges toward the center, the distortion of the shell increases, and a strong gas concentration is formed at the bottom of the concave part of the shell; the density of the gas clump attains 40-50 times that of a parent cloud, which is significantly higher than that formed behind a perturbed plane shock wave. This mechanism is likely to be involved when molecular clouds interact with H II regions, providing an effective path for fragmentation and star formation in a shock-compressed region.
Kimura Toshiya
Tosa Makoto
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