3 papers
astro-ph2003
Axisymmetric MHD simulations of the collapsar model for gamma-ray bursts
D. Proga, A. I. MacFadyen, P. J. Armitage +1
We present results from axisymmetric, time-dependent magnetohydrodynamic (MHD) simulations of the collapsar model for gamma-ray bursts. We begin the simulations after the 1.7 MSUN…
astro-ph2003
Gamma-ray bursts from alternating-current jets
M. Sikora, M. C. Begelman, P. Coppi +1
We propose a gamma-ray burst scenario involving relativistic jets dominated by Poynting flux with alternating toroidal magnetic fields. Such a structure may arise naturally if the…
astro-ph2003
Accretion of low angular momentum material onto black holes: 2D magnetohydrodynamical case
D. Proga, M. C. Begelman
We report on the second phase of our study of slightly rotating accretion flows onto black holes. We consider magnetohydrodynamical (MHD) accretion flows with a spherically symmetr…