Bromberg 2011 相对论喷流在外部介质的传播及准直

主要内容:
纯动力学的，不包含磁场。考虑了和外部介质作用的时候的侧向效应，可以作为一种准直机制。可以用于AGN，microquasar，GRB。

BTW，这个有可能是柱状喷流的一个证据哦。

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文章信息:

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Title:		The propagation of relativistic jets in external media
Authors:		Bromberg, Omer; Nakar, Ehud; Piran, Tsvi; Sari, Re'em
Publication:		eprint arXiv:1107.1326
Publication Date:		07/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		35 pages, 4 figures
Bibliographic Code:		2011arXiv1107.1326B

Abstract

Relativistic jets are ubiquitous in astrophysical systems that contain compact objects. They transport large amounts of energy to large distances from the source, and their interaction with the ambient medium has a crucial effect on the evolution of the system. The propagation of the jet is characterized by the formation of a shocked "head" at the front of the jet which dissipates the jet's energy and a cocoon that surrounds the jet and potentially collimates it. We present here a self consistent, analytic model that follows the evolution of the jet and its cocoon, and describes their interaction. We show that the critical parameter that determines the properties of the jet-cocoon system is the dimensionless ratio between the jet's energy density and the rest-mass energy density of the ambient medium. This parameter, together with the jet's injection angle, also determines whether the jet is collimated by the cocoon or not. The model is applicable to relativistic, unmagnetized, jets on all scales and may be used to determine the conditions in AGNs jets as well as in GRBs or microquasars. It shows that AGN and microquasar jets are hydrodynamically collimated due to the interaction with the ambient medium, while GRB jets can be collimated only inside a star and become uncollimated once they breakout.

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