Extremely weak reflection features in the X-ray spectrum of XTE J1118+480: possible evidence for X-ray-emitting jets?
Extremely weak reflection features in the X-ray spectrum of XTE J1118+480: possible evidence for X-ray-emitting jets?
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XTE J1118 480 的 X 射线光谱中的极弱反射特征：X 射线发射射流的可能证据？
DOI：
10.1046/j.1365-8711.2002.05636.x
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
W. Lewin
中科院分区：
文献类型：
--
作者：
J. Miller;D. Ballantyne;A. Fabian;W. Lewin
我们同时对银河系黑洞XTE J1118+480的钱德拉和RXTE光谱进行了三种x射线反射模型的拟合。我们探索了一系列吸积盘电离（log ξ = 1-4; ξ =L X /nR 2）和铁丰度（0.10-1.00）。我们与Ross & Fabian的等密度电离盘模型的拟合表明，所观察到的通量的反映≤0.5%（90%置信度上限）。与Magdziarz & Zdziarski的PEXRAV模型拟合表明，盘相对于入射硬x射线中心源的二维立体角（Ω/2π）为0.01 + 0。6 - 0。0 1。高倾角（i = 81°）、复配和整体速度的结合可能导致我们测量到的低反射分数。结果也与扩展射流是硬x射线通量的来源一致，因为从发射区域看，圆盘将代表一个小的立体角。
We have simultaneously fitted Chandra and RXTE spectra of the Galactic black hole XTE J1118+480 with three models for X-ray reflection. We explored a range of accretion disc ionizations (log ξ = 1-4; ξ =L X /nR 2 ) and ironabundances (0.10-1.00). Our fits with the constant-density ionized disc models of Ross & Fabian indicate that ≤0.5 per cent (90 per cent confidence upper limit) of the observed flux is reflected. Fits with the PEXRAV model of Magdziarz & Zdziarski indicate that the two-dimensional solid angle (Ω/2π) subtended by the disc relative to a central source of incident hard X-rays is 0.01 + 0 . 0 6 - 0 . 0 1 . A combination of the high inclination (i = 81°), Comptonization, and bulk velocities may contribute to the low reflection fractions we have measured. The results are also consistent with extended jets being the source of the hard X-ray flux, as the disc would then represent a small solid angle as seen from the emission region.