Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ptep.proc..339a&link_type=abstract
Plasma Turbulence and Energetic Particles in Astrophysics, Proceedings of the International Conference, Cracow (Poland), 5-10 Se
Astronomy and Astrophysics
Astrophysics
Scientific paper
Anisotropic gravitational collapse in which rotation, magnetic fields, and heating lead to a quadrupolar inflow/outflow pattern; have been well studied in a steady state. However such an approximation precludes any actual accretion and so does not permit a calculation of the quantity of material accreted relative to that ejected. The present work corrects this by studying a simple scaling class of time dependent solutions. These are well behaved `settling' solutions in their core region so that an actual central mass is growing there. Nevertheless a fraction of the equatorially infalling material is re-ejected in the form of a broad wind and/or an axial jet. The solutions may be scaled to protostellar objects or to the core regions of supernovae, where the accelerated outflow can be fast and narrow. Such a model may therefore contain the class of beams required for the γ-ray bursts. The time dependence also permits dipolar as well as quadrupolar magnetic fields and re-ejection from the central object in addition to quadrupolar circulation.
Aburihan Mahmoud
Henriksen Richard N.
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