On the fragmentation of rotating interstellar clouds

Details On the fragmentation of rotating interstellar clouds On the fragmentation of rotating interstellar clouds

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244...40b&link_type=abstract

Astrophysical Journal, Part 1, vol. 244, Feb. 15, 1981, p. 40-44.

Astronomy and Astrophysics

Astrophysics

7

Astrophysics, Gravitational Collapse, Interstellar Gas, Planetary Nebulae, Rotating Matter, Fragmentation, Isothermal Processes, Magnetohydrodynamics, Ring Structures

Scientific paper

Simple physical arguments are used to estimate the time scale for fragmentation of a collapsing, rotating, isothermal, interstellar cloud. This time scale is compared with a similarly estimated time scale for the collapse upon itself of a transitory ring structure. It is shown to be plausible for a cloud with a given ratio of rotational to gravitational energy (beta) that as the ratio of thermal to gravitational energy (alpha) is varied, there is an intermediate range of alpha where a ring forms and collapses on itself, prior to fragmentation. For higher or lower alpha, however, the cloud fragments prior to ring self-collapse. The analysis is compared with the results of numerical multidimensional, gravitational, hydrodynamical collapse and shown to be in good agreement with them.

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