@article {21970,
	title = {A model for GRB jets},
	volume = {287},
	year = {2003},
	month = {2003/01/1},
	pages = {249 - 252},
	abstract = {By using relativistic, axisymmetric, ideal MHD, we examine the motion of the baryon/e<SUP>+/-</SUP>/ photon fluid that emanates from a stellar-mass compact object/debris-disk system (a common outcome of many progenitor models). We prove that the motion can be described as a frozen pulse, which permits the study of each shell of the pancake-shaped outflow using steady-state equations. The ejected energy flux is dominated by the electromagnetic (Poynting) contribution, but it can also have a nonnegligible e<SUP>+/-</SUP>/radiation (thermal fireball) component. We demonstrate, through exact self-similar solutions, that the flow is first thermally and subsequently magnetically accelerated up to equipartition between kinetic and Poynting fluxes, i.e., ~ 50\% of the total energy is converted into baryonic kinetic energy. The electromagnetic forces also collimate the flow, reaching a cylindrical structure asymptotically.},
	isbn = {0004-640X},
	url = {https://ui.adsabs.harvard.edu/abs/2003Ap\&SS.287..249V},
	author = {Vlahakis, Nektarios and K{\"o}nigl, Arieh}
}
