Limits on pair production and multi-zone comptonization: The broadband spectrum of XTE J1550-564 revisited
Limits on pair production and multi-zone comptonization: The broadband spectrum of XTE J1550-564 revisited
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对生产和多区域复合化的限制：重新审视 XTE J1550-564 的宽带频谱
DOI：
10.1093/mnras/stv2909
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
C. Done
中科院分区：
文献类型：
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作者：
L. Hjalmarsdotter;M. Axelsson;C. Done
在高光度下，双黑洞的光谱具有强烈的盘状成分，并伴有同样强烈的尾状成分，其中至少有一些电子是非热的。我们重新分析了1998年XTE J1550-564爆发的同时asca - rxte - osse数据，该数据跨度为0.7-1000 keV，仍然是该状态下黑洞双星的最佳数据。我们重新评估了电子-正电子对生产的重要性，使用了一个实际的高值的源紧密度。由于没有可观测到的湮灭线，加上观测到的γ射线通量超过511 keV，限制了最大电子洛伦兹因子≤10，注入电子的斜率≤2.5。我们还使用快速（10-50 Hz）变异性谱来约束电子加热和加速的空间依赖性。我们发现快速变率的频谱与完全热的一致，因此观测到的非热发射是从流的更远的地方产生的。
At high luminosities black hole binaries show spectra with a strong disc component accompanied by an equally strong tail where at least some of the electrons are non-thermal. We reanalyse the simultaneousASCA–RXTE–OSSE data from the 1998 outburst of XTE J1550–564, which span 0.7–1000 keV and remain the best data available of a black hole binary in this state. We reassess the importance of electron–positron pair production using a realistically high value of the source compactness for the first time. The lack of an observable annihilation line together with the observed γ-ray flux beyond 511 keV constrains the maximum electron Lorentz factor to be ≤10, and the slope of the injected electrons to ≤2.5. We also use the fast (10–50 Hz) variability spectrum to constrain the spatial dependence of the electron heating and acceleration. We find that the spectrum of the fast variability is consistent with being fully thermal, so that the observed non-thermal emission is produced from further out in the flow.