中子星X射线双星GX 17+2的喷流发射、X射线态和硬X射线尾的联系
Linking Jet Emission, X-ray States and Hard X-ray Tails in the Neutron Star X-ray Binary GX 17+2
摘要：
本文介绍了Z型中子星X射线双星GX~17+2的射电（甚大阵）和X射线（Rossi-X射线定时探测器）同步观测结果。目的是评估整个X射线的三个快速变化的状态和在时间分辨过渡期间的X射线和无线电性能之间的耦合。这些观测结果使我们第一次定量地研究了射电辐射与硬X射线尾的存在和源的X射线状态之间的可能关系。观察结果表明：1）射电喷流发射和源的X射线状态之间的耦合，即在X射线硬度-强度图（HID）中的位置; 2）硬X射线尾部的存在和HID中的位置之间的耦合，定性地类似于对于射电发射所发现的耦合; 3）硬尾幂律分量中射电通量密度和X射线通量之间的定量正相关的指示; 4）与耀斑分支到正常分支X射线态跃迁有关的射电喷流形成的证据; 5）当X射线功率谱中的法向分支振荡（NBO）也稳定其特征频率时，新形成的喷流的无线电通量密度稳定，表明与NBO相关的X射线变化性与射流形成之间可能存在关系。我们讨论我们的结果的背景下，喷气机模型。
英文摘要：
We present the results from simultaneous radio (Very Large Array) and X-ray (Rossi-X-ray Timing Explorer) observations of the Z-type neutron star X-ray binary GX~17+2. The aim is to assess the coupling between X-ray and radio properties throughout its three rapidly variable X-ray states and during the time-resolved transitions. These observations allow us, for the first time, to investigate quantitatively the possible relations between the radio emission and the presence of the hard X-ray tails and the X-ray state of the source. The observations show: 1) a coupling between the radio jet emission and the X-ray state of the source, i.e. the position in the X-ray hardness-intensity diagram (HID); 2) a coupling between the presence of a hard X-ray tail and the position in the HID, qualitatively similar to that found for the radio emission; 3) an indication for a quantitative positive correlation between the radio flux density and the X-ray flux in the hard-tail power law component; 4) evidence for the formation of a radio jet associated with the Flaring Branch-to-Normal Branch X-ray state transition; 5) that the radio flux density of the newly-formed jet stabilizes when also the normal-branch oscillation (NBO) in the X-ray power spectrum stabilizes its characteristic frequency, suggesting a possible relation between X-ray variability associated to the NBO and the jet formation. We discuss our results in the context of jet models.
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