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arXiv 1105.4896astro-ph.HE
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黑洞双星瞬变喷流模型的X射线辐射

X-ray Emission from Transient Jet Model in Black Hole Binaries

Asaf Pe'er, Sera Markoff

摘要:

虽然已知X射线双星(XRB)中至少通过硬态近红外发射的非热射电起源于喷流,但非热X射线成分的来源仍然不确定。我们引入了一个新的模型,考虑到这种排放的瞬态性质的流出,并表明它可以解释所观察到的X射线光谱的属性。电子的快速辐射冷却自然解释了在10 keV以下经常看到的断裂,以及在断裂以下观察到的正则光谱斜率F_v ~ v ^{-1/2}。我们推导出同步加速器和康普顿主导的模型的数据设置的约束。我们表明,对于同步加速器占主导地位的情况下,射流应在半径相当于磁盘的内径(约100 r_s的2000年爆发的XTE J1118+480),与典型的磁场B >~ 10^{6} G。我们讨论的后果,我们的结果上的流入和流出的硬态XRB之间的可能的连接。

英文摘要:

While the non-thermal radio through at least near-infrared emission in the hard state in X-ray binaries (XRBs) is known to originate in jets, the source of the non-thermal X-ray component is still uncertain. We introduce a new model for this emission, which takes into account the transient nature of outflows, and show that it can explain the observed properties of the X-ray spectrum. Rapid radiative cooling of the electrons naturally accounts for the break often seen below around 10 keV, and for the canonical spectral slope F_ν~ ν^{-1/2} observed below the break. We derive the constraints set by the data for both synchrotron- and Compton-dominated models. We show that for the synchrotron-dominated case, the jet should be launched at radii comparable to the inner radius of the disk (~few 100 r_s for the 2000 outburst of XTE J1118+480), with typical magnetic field B >~ 10^{6} G. We discuss the consequences of our results on the possible connection between the inflow and outflow in the hard state of XRBs.

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