特殊中子星Circinus X-1的喷流发射和X射线性质的联系
Linking jet emission and X-ray properties in the peculiar neutron star X-ray binary Circinus X-1
摘要：
介绍了2000年10月和2002年12月利用Rossi X射线定时探测卫星和澳大利亚望远镜紧凑阵列对奇特的Z型中子星X射线双星Cir X-1进行的X射线和射电同步观测结果。我们确定典型的Z源的功率密度谱的行为，以及在X射线硬度强度图中绘制的特征Z图案。典型的明亮的环礁源的功率谱也被确定在轨道阶段后，近星点通道，而轨道阶段前的近星点通道的特点是功率谱既不是典型的Z也不是环礁源。我们调查的X射线和无线电特性之间的耦合，侧重于三个轨道阶段时，已检测到的无线电通量密度的增强，测试之间的联系的流入（X射线）和流出（无线电喷流）/从紧凑的对象。在三分之二的情况下，我们将射电喷流的存在与X射线的光谱跃迁联系起来，尽管这种跃迁并不像在其他Z源中检测到的那样先于射电耀斑。最近在候选的黑洞GX 339-4中发现了类似的行为。在第三种情况下，射电光变曲线显示出与X射线光变曲线相似的形状。我们讨论我们的结果的背景下，喷流模型，也考虑黑洞候选人。
英文摘要：
We present the results of simultaneous X-ray and radio observations of the peculiar Z-type neutron star X-ray binary Cir X-1, observed with the Rossi X-ray timing explorer satellite and the Australia Telescope Compact Array in 2000 October and 2002 December. We identify typical Z source behaviour in the power density spectra as well as characteristic Z patterns drawn in an X-ray hardness-intensity diagram. Power spectra typical of bright atoll sources have also been identified at orbital phases after the periastron passage, while orbital phases before the periastron passage are characterized by power spectra that are typical neither of Z nor of atoll sources. We investigate the coupling between the X-ray and the radio properties, focusing on three orbital phases when an enhancement of the radio flux density has been detected, to test the link between the inflow (X-ray) and the outflow (radio jet) to/from the compact object. In two out of three cases we associate the presence of the radio jet to a spectral transition in the X-rays, although the transition does not precede the radio flare, as detected in other Z sources. An analogous behaviour has recently been found in the black hole candidate GX 339-4. In the third case, the radio light curve shows a similar shape to the X-ray light curve. We discuss our results in the context of jet models, considering also black hole candidates.
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