Mimica 2009 磁化内激波的效率可以很高

主要内容:
而且不怎么依赖于相对罗仑兹因子和状态方程.

(当然, 因为能量主要靠释放磁场的能量.)

精彩摘抄:


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Title:		On the dynamic efficiency of internal shocks in magnetized relativistic outflows
Authors:		Mimica, P.; Aloy, M. A.
Publication:		eprint arXiv:0909.1328
Publication Date:		09/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		Accepted for publication in MNRAS. 8 pages, 6 figures. The definitive version is available at http://www.blackwell-synergy.com
Bibliographic Code:		2009arXiv0909.1328M

Abstract

We study the dynamic efficiency of conversion of kinetic-to-thermal/magnetic energy of internal shocks in relativistic magnetized outflows. We model internal shocks as being caused by collisions of shells of plasma with the same energy flux and a non-zero relative velocity. The contact surface, where the interaction between the shells takes place, can break up either into two oppositely moving shocks (in the frame where the contact surface is at rest), or into a reverse shock and a forward rarefaction. We find that for moderately magnetized shocks (magnetization $\sigma\simeq 0.1$), the dynamic efficiency in a single two-shell interaction can be as large as 40%. Thus, the dynamic efficiency of moderately magnetized shocks is larger than in the corresponding unmagnetized two-shell interaction. If the slower shell propagates with a sufficiently large velocity, the efficiency is only weakly dependent on its Lorentz factor. Consequently, the dynamic efficiency of shell interactions in the magnetized flow of blazars and gamma-ray bursts is effectively the same. These results are quantitatively rather independent on the equation of state of the plasma. The radiative efficiency of the process is expected to be a fraction $f_r<1$>

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