Gravitational Instability in a Cold Magnetized Molecular Cloud with Ambipolar Drift

Details Gravitational Instability in a Cold Magnetized Molecular Cloud with Ambipolar Drift Gravitational Instability in a Cold Magnetized Molecular Cloud with Ambipolar Drift

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.7104i&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #71.04; Bulletin of the American Astronomical Society, Vol. 30, p.1356

Astronomy and Astrophysics

Astronomy

Scientific paper

I present a numerical simulation of gravitational instability in a thin, cold, magnetized molecular cloud with ambipolar diffusion. The nonlinear evolution of density perturbations shows many of the characteristics evident in the linear analytic theory. The presence of ambipolar diffusion decreases the stability of clouds, and density enhancements grow on a time-scale intermediate to the dynamical collapse and diffusive time-scales. This instability can cause the collapse of dense cores with significant loss of magnetic flux. The magnetic and velocity fields in the simulation become quite complex, and this mechanism is a possible source of magnetized turbulence in clouds. Thermal pressure in the cloud stabilizes the smallest spatial scales, and the instability produces cloud cores or fragments on the order of ~ 1M_&sun;.

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