黑洞瞬变GX 339-4近红外快速测光的物理约束
Physical constraints from near-infrared fast photometry of the black-hole transient GX 339-4
摘要：
我们介绍了黑洞瞬态GX 339- 4在其2015年爆发衰变期间的第一次多历元X射线/红外快速测光活动的结果。我们研究了功率谱密度的演变，发现两个波段之间存在很大差异。X射线功率谱密度遵循标准的演化模式，合理地反映了吸积流的变化。相反，IR功率谱密度的演变非常缓慢，在整个活动中，高频中断与保持恒定在$0.63 \pm 0.03$ Hz一致。我们讨论了这一结果的背景下，目前可用的红外发射模型在黑洞瞬态。虽然所有的模型将需要对这个意想不到的限制进行定量测试，我们表明，红外发射相对论性喷流过滤出的短时间尺度的波动注入吸积流入似乎是最合理的情况。
英文摘要：
We present results from the first multi-epoch X-ray/IR fast-photometry campaign on the black-hole transient GX 339--4, during its 2015 outburst decay. We studied the evolution of the power spectral densities finding strong differences between the two bands. The X-ray power spectral density follows standard patterns of evolution, plausibly reflecting changes in the accretion flow. The IR power spectral density instead evolves very slowly, with a high-frequency break consistent with remaining constant at $0.63 \pm 0.03$ Hz throughout the campaign. We discuss this result in the context of the currently available models for the IR emission in black-hole transients. While all models will need to be tested quantitatively against this unexpected constraint, we show that an IR emitting relativistic jet which filters out the short-timescales fluctuations injected from the accretion inflow appears as the most plausible scenario.
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