Triggering the collapse of self-gravitating clouds by torsional Alfven waves

Details Triggering the collapse of self-gravitating clouds by torsional Alfven waves Triggering the collapse of self-gravitating clouds by torsional Alfven waves

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43..703h&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 5, 1991, p. 703-718. Research supported by Japan Soci

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Gravitational Collapse, Magnetohydrodynamic Waves, Molecular Clouds, Carbon Monoxide, Computational Astrophysics, Interstellar Magnetic Fields, Molecular Flow, Torsional Stress

Scientific paper

In the present paper, by adding a toroidal magnetic field a simulation is developed of the magnetic pinching process of an isothermal cloud which is stabilized by a poroidal magnetic field, and the triggering of a gravitational instability of the cloud is studied. Simulations are made by using a 3D smoothed-particle magnetohydrodynamic code for the range of physical parameters and the mass of the clump appropriate for the situation. The magnetic effects of star formation in a large-scale field can actually trigger the gravitational collapse of another clump of mass on the same flux tube which is well on the stable side of the criterion for the gravitational instability. It is suggested that this process - which takes place along a magnetic flux tube - can form a long dense streak with a triggered collapse of mass relaying the nonlinear torsional Alfven waves. This can explain the observation of winding dense streaks in the streamers along which infrared stars line up in cases such as L1641 in Orion.

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