arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.11423astro-ph.HE
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河外喷流的不同特征:相对论性气流减速的作用

The different flavors of extragalactic jets: the role of relativistic flow deceleration

P. Rossi, G. Bodo, S. Massaglia, A. Capetti

摘要:

我们进行三维数值模拟的相对论(洛伦兹因子为10),非磁化射流在均匀密度的环境中传播,为了研究卷吸和随之而来的减速的效果。我们的模拟研究了星系核心内的喷流传播,在那里,最有可能的是,减速发生得更有效。我们比较了不同的密度和压力比的情况下,相对于周围的介质发现,低密度射流有效地减速,并达到准稳态,在600射流半径的长度,从高到次相对论速度减慢。相反,密度较大的射流在相同长度上保持高度相对论速度。我们讨论这些结果的Faranoff莱利(FR)的放射源分类。我们推测,低密度喷流可以产生FR 0和FR I射电源,而高密度喷流可能与FR II射电源有关。

英文摘要:

We perform three-dimensional numerical simulations of relativistic (with a Lorentz factor of 10), non magnetized jets propagating in a uniform density environment, in order to study the effect of the entrainment and the consequent deceleration. Our simulations investigate the jet propagation inside the galaxy core, where, most likely, the deceleration occurs more efficiently. We compare cases with different density and pressure ratios with respect to the ambient medium finding that low density jets are efficiently decelerated and reach a quasi steady state in which, over a length of 600 jet radii, slow down from highly to sub-relativistic velocities. At the opposite, denser jets keep highly relativistic velocity over the same length. We discuss these results in relation to the Faranoff Riley (FR) radio-sources classification. We infer that lower density jets can give rise to FR 0 and FR I radio-sources, while higher density jets may be connected to FR II radio-sources.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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