Gravitational collapse of polytropic, magnetized, filamentary clouds

Details Gravitational collapse of polytropic, magnetized, filamentary clouds Gravitational collapse of polytropic, magnetized, filamentary clouds

2004-11-02

arxiv.org/abs/astro-ph/0411062v1

Mon.Not.Roy.Astron.Soc. 356 (2005) 1429-1434

Astronomy and Astrophysics

Astrophysics

accepted by MNRAS

Scientific paper

10.1111/j.1365-2966.2004.08575.x

When the gas of a magnetized filamentary cloud obeys a polytropic equation of state, gravitational collapse of the cloud is studied using a simplified model. We concentrate on the radial distribution and restrict ourselves to the purely toroidal magnetic field. If the axial motions and poloidal magnetic fields are sufficiently weak, we could reasonably expect our solutions to be a good approximation. We show that while the filament experiences gravitational condensation and the density at the center increases, the toroidal flux-to-mass ratio remains constant. A series of spatial profiles of density, velocity and magnetic field for several values of the toroidal flux-to-mass ratio and the polytropic index, is obtained numerically and discussed.

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