标题： GRS 1915+105中的反相关硬X射线时间延迟：截断吸积盘的证据 显示英文标题

标题： Anti-correlated hard X-ray time lag in GRS 1915+105: evidence for a truncated accretion disc

摘要： 银河系黑洞候选源的多波段观测表明吸积盘辐射与喷流辐射之间存在密切联系。最近在天鹅座 X-3 中发现软硬 X 射线之间存在反相关时间滞后（Choudhury & Rao 2004），这限制了盘-喷流连接的几何图像为截断的吸积盘，截断半径接近黑洞。我们在此报告超光速喷流源 GRS 1915+105 中类似反相关时间滞后的探测。我们展示了在延迟反相关期间 X 射线谱中存在拐点，并且还发现准周期振荡 (QPO) 参数随谱的拐点而变化。我们探讨理论模型以理解这一现象。 显示英文摘要

摘要： Multi-wavelength observations of Galactic black hole candidate sources indicate a close connection between the accretion disk emission and the jet emission. The recent discovery of an anti-correlated time lag between the soft and hard X-rays in Cygnus X-3 (Choudhury & Rao 2004) constrains the geometric picture of the disk-jet connection into a truncated accretion disk, the truncation radius being quite close to the black hole. Here we report the detection of similar anti-correlated time lag in the superluminal jet source GRS 1915+105. We show the existence of the pivoting in the X-ray spectrum during the delayed anti-correlation and we also find that the QPO parameters change along with the spectral pivoting. We explore theoretical models to understand this phenomenon.