AI 中文总结
通过对Swift J1727.8-1613中间态的多波段观测分析，发现其OIR与X射线辐射存在能量依赖的复杂关联，为研究黑洞暂现源的辐射机制提供了观测依据。
AI 中文摘要
我们对黑洞暂现源Swift J1727.8-1613处于中间态期间的情况进行了计时分析，利用2023年9月9日获取的Insight-HXMT（2-150 keV）的协调宽带X射线观测数据，以及ULTRACAM（g_s和i_s波段）的光学数据、HAWK-I（K_s波段）的近红外数据。如先前研究所示，傅里叶功率谱在K_s、i_s和X射线波段呈现出强准周期振荡（QPO）。互相关分析揭示了光学/近红外（OIR）与X射线辐射之间存在复杂耦合，包括延迟的光学反关联、强红外关联，以及这些特征对X射线能量的显著依赖，表明存在多个康普顿化区域。相比之下，在QPO频率处，滞后特性并未发生变化，在高达150 keV的能量范围内，OIR滞后约为60-80 ms。我们在小尺度喷流和热吸积流场景的框架下讨论了这些结果。
英文摘要
We present a timing analysis of the black hole transient Swift J1727.8-1613 during its intermediate state. We use coordinated broadband X-ray observations from Insight-HXMT (2-150 keV), together with optical data from ULTRACAM (g_s and i_s bands) and near-infrared data from HAWK-I (K_s band), obtained on 2023 September 9. As shown by previous studies, the Fourier power spectrum shows a strong quasi-periodic oscillation (QPO) in the K_s, i_s and X-ray bands. Cross-correlation analysis reveals a complex coupling between the optical/near-infrared (OIR) and X-ray emission, including a delayed optical anti-correlation, a strong infrared correlation, and a pronounced dependence of these features on X-ray energy, suggesting multiple Comptonisation regions. In contrast, the lag properties do not change at the QPO frequency, displaying an OIR lag of ~60-80 ms up to 150 keV. We discuss these results in the context of small-scale jet and hot accretion flow scenarios.
Comments9 pages, 9 figures. Accepted for publication in MNRAS
