从GX339-4的同时射电-X射线拟合得到的喷流行为的线索
Clues on jet behavior from simultaneous radio-X-ray fits of GX339-4
摘要：
几十年来，对X射线双星爆发过程中吸积-抛射机制的理解一直是一个难题。目前还不清楚是什么控制着这些天体从硬态到软态的光谱演化，然后在爆发结束时又回到硬态，追踪硬度-强度图中众所周知的滞后循环。此外，频谱状态和无线电发射的存在/不存在之间的联系仍然存在很大争议。在一系列的论文中，我们发展了一个由截断的外标准吸积盘（SAD，来自Shakura和Sunyaev的解决方案）和内喷流发射盘（JED）组成的模型。在这个范例中，JED扮演了热日冕的角色，同时解释了无线电喷流的存在。我们的目标是首次将JED-SAD模型的直接拟合程序应用于RXTE在2000-2010十年期间观察到的GX 339-4四次爆发的硬态，并结合同时或准同时ATCA观测。我们构建了在Xspec中可用的JED-SAD模型表以及基于Xillver模型的反射模型表。我们将我们的模型应用于RXTE/PCA获得的452个硬态观测。我们能够正确地拟合X射线光谱，同时再现无线电通量。我们发现，无线电发射的模型参数（主要是吸积率和JED和SAD之间的过渡半径）的函数依赖性是相似的GX 339-4的不同爆发的所有上升阶段之间。但它与衰减阶段得到的函数依赖性有很大不同。这一结果强烈表明，在爆发的开始和结束之间的喷射的辐射和/或动力学性质的变化。我们讨论了可能的情况，可以解释这些差异。
英文摘要：
Understanding the mechanisms of accretion-ejection during X-ray binaries outbursts has been a problem for several decades. It is still not clear yet what controls the spectral evolution of these objects from the hard to the soft states and then back to the hard states at the end of the outburst, tracing the well-known hysteresis cycle in the hardness-intensity diagram. Moreover, the link between the spectral states and the presence/absence of radio emission is still highly debated. In a series of papers, we developed a model composed of a truncated outer standard accretion disk (SAD, from the solution of Shakura and Sunyaev) and an inner jet emitting disk (JED). In this paradigm, the JED plays the role of the hot corona while simultaneously explaining the presence of a radio jet. Our goal is to apply for the first time direct fitting procedures of the JED-SAD model to the hard states of four outbursts of GX 339-4 observed during the 2000-2010 decade by RXTE, combined with simultaneous or quasi simultaneous ATCA observations. We built JED-SAD model tables usable in Xspec as well as a reflection model table based on the Xillver model. We apply our model to the 452 hard state observations obtained with RXTE/PCA. We were able to correctly fit the X-ray spectra and simultaneously reproduce the radio flux. We show that the functional dependency of the radio emission on the model parameters (mainly the accretion rate and the transition radius between the JED and the SAD) is similar between all the rising phases of the different outbursts of GX 339-4. But it is significantly different from the functional dependency obtained in the decaying phases. This result strongly suggests a change in the radiative and/or dynamical properties of the ejection between the beginning and the end of the outburst. We discuss possible scenarios that could explain these differences.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
