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arXiv 1003.0145astro-ph.HE
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旋进喷流系统SS 433 II的结构和磁场。喷流的固有亮度

Structure and Magnetic Fields in the Precessing Jet System SS 433 II. Intrinsic Brightness of the Jets

David H. Roberts, John F. C. Wardle, Michael R. Bell, Matthew R. Mallory, Valerie V. Marchenko, Phoebe U. Sanderbeck

摘要:

双星X射线源SS 433(有时被归类为微类星体)的深甚大阵成像已被用于研究其射电喷流的内在亮度分布和演化。通过去除多普勒增强和投影效应,恢复了作为喷射材料τ发射时年龄的函数的喷射的固有亮度。我们发现,当τ相等时,这两股喷流本质上非常相似,并且它们最好用D^{2+alpha}形式的多普勒增强来描述,正如对连续喷流所预期的那样。喷流的固有亮度作为年龄的函数,表现出复杂的方式。在60 <τ < 150天的年龄范围内,喷流衰减最好用τ的指数函数表示,但在统计上不排除线性或幂律函数。这之后是一个区域到τ ~ 250天,在此期间,内在亮度基本上是恒定的。在稍后的时间,射流衰减可以大致拟合为τ的指数或幂律函数。

英文摘要:

Deep Very Large Array imaging of the binary X-ray source SS 433, sometimes classified as a microquasar, has been used to study the intrinsic brightness distribution and evolution of its radio jets. The intrinsic brightness of the jets as a function of age at emission of the jet material tau is recovered by removal of the Doppler boosting and projection effects. We find that intrinsically the two jets are remarkably similar when compared for equal tau, and that they are best described by Doppler boosting of the form D^{2+alpha}, as expected for continuous jets. The intrinsic brightnesses of the jets as functions of age behave in complex ways. In the age range 60 < tau < 150 days, the jet decays are best represented by exponential functions of tau, but linear or power law functions are not statistically excluded. This is followed by a region out to tau ~ 250 days during which the intrinsic brightness is essentially constant. At later times the jet decay can be fit roughly as exponential or power law functions of tau.

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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