对1998年爆发期间XTE J1550-564中相对论抛射事件的再认识
Revisiting the relativistic ejection event in XTE J1550-564 during the 1998 outburst
摘要：
我们重新发现爆发的X射线瞬态XTE J1550-564期间，相对论性喷流观察于1998年9月，并审查与澳大利亚长基线阵列获得的无线电图像，和光变曲线与莫隆格洛天文台综合望远镜和澳大利亚望远镜紧凑阵列。基于HI谱，我们将源距离限制在3.3和4.9 kpc之间。这些相隔两天拍摄的无线电图像显示了喷射事件的演变。最外层两个喷出物的视分离速度至少为1.3c，可能高达1.9c;当考虑相对论效应时，推断的真实速度大于0.8c。在爆发期间，通量密度似乎同时达到峰值，光谱指数相当平坦（尽管仍然很薄），为-0.2。
英文摘要：
We revisit the discovery outburst of the X-ray transient XTE J1550-564 during which relativistic jets were observed in 1998 September, and review the radio images obtained with the Australian Long Baseline Array, and lightcurves obtained with the Molonglo Observatory Synthesis Telescope and the Australia Telescope Compact Array. Based on HI spectra, we constrain the source distance to between 3.3 and 4.9 kpc. The radio images, taken some two days apart, show the evolution of an ejection event. The apparent separation velocity of the two outermost ejecta is at least 1.3c and may be as large as 1.9c; when relativistic effects are taken into account, the inferred true velocity is >0.8c. The flux densities appear to peak simultaneously during the outburst, with a rather flat (although still optically thin) spectral index of -0.2.
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