Long Term Simulations Of Astrophysical Jets; Energy Structure and Quasi-Periodic Ejection

Details Long Term Simulations Of Astrophysical Jets; Energy Structure and Quasi-Periodic Ejection Long Term Simulations Of Astrophysical Jets; Energy Structure and Quasi-Periodic Ejection

2007-04-23

arxiv.org/abs/0704.2918v1

PASJ Vol. 59, No. 3. (to be issued on June 25, 2007)

Astronomy and Astrophysics

Astrophysics

21 pages, 19 figures

Scientific paper

We have performed self-consistent 2.5-dimensional nonsteady MHD numerical simulations of jet formation as long as possible, including the dynamics of accretion disks. Although the previous nonsteady MHD simulations for astrophysical jets revealed that the characteristics of nonsteady jets are similar to those of steady jets, the calculation time of these simulations is very short compared with the time scale of observed jets. Thus we have investigated long term evolutions of mass accretion rate, mass outflow rate, jet velocity, and various energy flux. We found that the ejection of jet is quasi-periodic. The period of the ejection is related to the time needed for the initial magnetic filed to be twisted to generate toroidal filed. We compare our results with both the steady state theory and previous 2.5-dimensional nonsteady MHD simulations.

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