GX 339-4的X射线滞后研究：十年来的圆盘和铁线
Studying the X-ray hysteresis in GX 339-4: the disc and iron line over one decade
摘要：
我们报告对GX 339-4的X射线发射进行了全面和一致的调查。对11年RXTE档案中的所有公众观察进行了分析。三种不同类型的模型-单一的幂律，破碎的幂律和一个光盘+幂律-适合调查光盘的演变，随着一个固定的高斯分量在6.4千电子伏调查光谱中的任何铁线。我们发现，流量和X射线颜色之间的两个最好的采样爆发的相对变化是非常相似的。在软态下，可以清楚地看到爆发期间盘温度的衰减。预期的衰减为S_Disc \propto T^4;我们测得T^4.75 \pm 0.23。这意味着在软状态下，内部盘半径近似恒定。在软态下，铁谱线的有效宽度与X射线通量之间存在显著的反相关关系，而在硬态下，铁谱线的有效宽度与通量无关。这导致X射线通量与线通量和EW两者之间的关系中的滞后。为了将X射线双星爆发与活动星系核中的行为进行比较，我们绘制了GX 339-4的盘分光度图，这是第一张X射线双星的盘分光度图。其形状与活动星系核的形状在性质上相匹配。将其与GX 339-4的无线电发射联系起来，可以清楚地看到圆盘和幂律主导状态之间的无线电频谱变化。
英文摘要：
We report on a comprehensive and consistent investigation into the X-ray emission from GX 339-4. All public observations in the 11 year RXTE archive were analysed. Three different types of model - single powerlaw, broken powerlaw and a disc + powerlaw - were fitted to investigate the evolution of the disc, along with a fixed gaussian component at 6.4 keV to investigate any iron line in the spectrum. We show that the relative variation in flux and X-ray colour between the two best sampled outbursts are very similar. The decay of the disc temperature during the outburst is clearly seen in the soft state. The expected decay is S_Disc \propto T^4; we measure T^4.75\pm0.23. This implies that the inner disc radius is approximately constant in the soft state. We also show a significant anti-correlation between the iron line significant width and the X-ray flux in the soft state while in the hard state the EW is independent of the flux. This results in hysteresis in the relation between X-ray flux and both line flux and EW. To compare the X-ray binary outburst to the behaviour seen in AGN, we construct a Disc Fraction Luminosity Diagram for GX 339-4, the first for an X-ray binary. The shape qualitatively matches that produced for AGN. Linking this with the radio emission from GX 339-4 the change in radio spectrum between the disc and power-law dominated states is clearly visible.
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