Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-31
Astrophys.J. 607 (2004) L39-L42
Astronomy and Astrophysics
Astrophysics
10 pages, 5 figures, aastex, accepted by ApJ Letters
Scientific paper
10.1086/421464
We extend our earlier work on ambipolar diffusion induced formation of protostellar cores in isothermal sheet-like magnetic interstellar clouds, by studying nonaxisymmetric collapse for the physically interesting regime of magnetically critical and supercritical model clouds ($\mui \geq 1$, where $\mui$ is the initial mass-to-magnetic flux ratio in units of the critical value for gravitational collapse). Cores that form in model simulations are effectively triaxial, with shapes that are typically closer to being oblate, rather than prolate. Infall velocities in the critical model ($\mui = 1$) are subsonic; in contrast, a supercritical model ($\mui = 2$) has extended supersonic infall that may be excluded by observations. For the magnetically critical model, ambipolar diffusion forms cores that are supercritical ($\muc > 1$) and embedded within subcritical envelopes ($\muenv < 1$). Cores in our models have density profiles that eventually merge into a near-uniform background, which is suggestive of observed properties of cloud cores.
Basu Shantanu
Ciolek Glenn E.
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