黑洞源H1743-322准周期振荡快速跃迁的谱时研究
Spectro-temporal studies of rapid transition of the quasi periodic oscillations in the black hole source H1743-322
摘要：
与X射线通量变化相关的QPO的出现或消失可以用来解释黑洞X射线源的吸积喷射机制。我们利用RXTE档案数据对H1743-322的这种快速跃迁进行了研究，发现了8个QPO随X射线通量变化而突然消失的事件。QPO的出现/消失与在$\sim$ 4.5 Hz下表现出B型QPO的4起事件相关，在$ν$ $\sim$ 3.5 Hz下表现出A型QPO的1起事件相关，其余3起事件与在$\sim$ 9.5 Hz下表现出C型QPO相关。光谱研究的数据揭示，内部磁盘半径保持在相同的位置约2-9 r $_g$，取决于所使用的模型，但幂律指数变化，表明无论是电晕或射流是负责的事件。根据等离子体喷射模型估算出日冕的可能喷射半径为4.2-15.4 r $_g$。我们的X射线和准同时射电相关研究表明，B型QPO可能与弱喷流的进动有关，尽管在其底部存在一个小而弱的日冕，而C型QPO则与一个相对较强的喷流的底部有关，该喷流的作用类似于日冕。
英文摘要：
An appearance or disappearance of QPOs associated with the variation of X-ray flux can be used to decipher the accretion ejection mechanism of black hole X-ray sources. We searched and studied such rapid transitions in H1743-322 using RXTE archival data and found eight such events, where QPO vanishes suddenly along with the variation of X-ray flux. The appearance/disappearance of QPOs were associated to the four events exhibiting type-B QPOs at $\sim$ 4.5 Hz, one with type-A QPO at $ν$ $\sim$ 3.5 Hz, and the remaining three were connected to type-C QPOs at $\sim$ 9.5 Hz. Spectral studies of the data unveiled that an inner disk radius remained at the same location around 2-9 r$_g$ , depending on the used model but power-law indices were varying, indicating that either corona or jet is responsible for the events. The probable ejection radii of corona were estimated to be around 4.2-15.4 r$_g$ based on the plasma ejection model. Our X-ray and quasi-simultaneous radio correlation studies suggest that the type-B QPOs are probably related to the precession of a weak jet though a small and weak corona is present at its base and the type-C QPOs are associated to the base of a relatively strong jet which is acting like a corona.
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