在4U 1543-47的软中间状态下出现紧凑型喷流
The appearance of a compact jet in the soft-intermediate state of 4U 1543-47
摘要：
最近在黑洞候选X射线双星（BHXB）的喷流盘耦合的理解的进展提供了无线电喷流发射和X射线光谱和变化行为之间的密切联系。在“软”X射线状态下，射流被抑制，但目前的图片缺乏对与这些射流的淬火或恢复相关的X射线特征的理解。在这里，我们发现BHXB 4U 1543-47在主要软X射线状态期间出现了短暂的~4天红外（IR）增亮，同时出现了强X射线B型准周期振荡（QPO）、轻微的光谱硬化和均方根变化的增加，表明向软中间态（SIMS）的漂移。这个红外“耀斑”的光谱指数与光学薄同步辐射一致，最有可能起源于稳定，紧凑的射流。这种核心喷流发射的红外线通常只与硬态，其外观在二次离子质谱法的地方之间的二次离子质谱法和软态的硬度-强度图为这个源的“喷射线”。红外辐射产生于喷流发射点附近的一个小区域（约0.1光秒），4U 1543-47中的红外耀斑的时间尺度太长，不可能是由一次单独的喷射引起的。我们还提出了一个总结整个爆发的射流和X射线光谱/可变性属性的演变，约束射流的贡献，在衰变过程中的X射线通量。
英文摘要：
Recent advancements in the understanding of jet-disc coupling in black hole candidate X-ray binaries (BHXBs) have provided close links between radio jet emission and X-ray spectral and variability behaviour. In 'soft' X-ray states the jets are suppressed, but the current picture lacks an understanding of the X-ray features associated with the quenching or recovering of these jets. Here we show that a brief, ~4 day infrared (IR) brightening during a predominantly soft X-ray state of the BHXB 4U 1543-47 is contemporaneous with a strong X-ray Type B quasi-periodic oscillation (QPO), a slight spectral hardening and an increase in the rms variability, indicating an excursion to the soft-intermediate state (SIMS). This IR 'flare' has a spectral index consistent with optically thin synchrotron emission and most likely originates from the steady, compact jet. This core jet emitting in the IR is usually only associated with the hard state, and its appearance during the SIMS places the 'jet line' between the SIMS and the soft state in the hardness-intensity diagram for this source. IR emission is produced in a small region of the jets close to where they are launched (~ 0.1 light-seconds), and the timescale of the IR flare in 4U 1543-47 is far too long to be caused by a single, discrete ejection. We also present a summary of the evolution of the jet and X-ray spectral/variability properties throughout the whole outburst, constraining the jet contribution to the X-ray flux during the decay.
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